Key Facts

• Latest Rugged Flagships: Apple’s newly announced Watch Ultra 3 (Sept 2025) and Garmin’s Fenix 8 Pro are two top-tier adventure smartwatches built for extreme sports and outdoor use. Both introduce satellite messaging capabilities and significant upgrades in display and battery life over their predecessors.
• Battery & Display: The Ultra 3 boasts up to 42 hours of battery life (72 hours in low-power mode) and a larger, brighter LTPO3 OLED display – Apple’s biggest yet. The Fenix 8 Pro offers vastly longer stamina, lasting 15–27 days per charge (8–15 days always-on) depending on model. It comes in 47 mm and 51 mm sizes with a high-brightness AMOLED screen, plus an ultra-premium 51 mm MicroLED variant that hits a record 4,500 nits brightness tomsguide.com.
• Connectivity & Sensors: Both watches feature dual-frequency GPS for ultra-precise tracking, advanced optical heart-rate sensors, and a full array of altimeters, compasses, and SpO₂ sensors. The Apple Watch Ultra 3 adds 5G cellular support and is the first Apple Watch with two-way satellite SOS and messaging (free for 2 years for emergencies). The Garmin Fenix 8 Pro integrates Garmin’s inReach satellite tech and built-in LTE, enabling phone-free calls, two-way texts, LiveTrack sharing, and SOS from the wrist (subscription required).
• Rugged Design: Both are built to endure harsh conditions. The Ultra 3’s 49 mm titanium case (now in natural or black) is MIL-STD-810H certified, 100 m water-resistant (with dive computer functionality to 40 m), and sports a robust sapphire display with a protective raised bezel. The Fenix 8 Pro’s fiber-reinforced case (with steel or DLC titanium bezel on sapphire models) is likewise 10 ATM water-rated and MIL-STD tough, offered in larger 47/51 mm sizes for a bold, utilitarian look. Physical controls differ: Apple provides a large digital crown + side and Action buttons, while Garmin uses its signature 5-button layout (plus a touchscreen) optimized for gloves and wet conditions.
• Health & Training Features: Apple introduces hypertension monitoring (high blood pressure alerts via optical sensor data) and a new Sleep Score in the Ultra 3, alongside existing ECG, blood oxygen, temperature sensing, and fitness rings ecosystem. Garmin counters with its rich training analytics – VO₂ max, training load, recovery time, HRV status – and multi-sport modes. Both track running power, advanced metrics (Apple added running track detection and Swolf swim scores wired.com wired.com), but Garmin’s training analysis is deeper (performance condition, training readiness, etc.), while Apple’s smartwatch features are stronger (third-party apps, voice assistant, seamless iPhone integration).
• Real-World Performance: Early tests show stellar GPS accuracy on both. A marathon head-to-head found the Ultra’s distance tracking “impressively close” to official course length, with the Fenix 8 similarly accurate (their GPS tracks were nearly identical). However, Garmin’s optical HR was more consistent during intense exercise, whereas the Apple Watch struggled for the first hour before stabilizing. Experts praise the Fenix 8 Pro as “one of the most expensive… but also the best” sports watches for its reliable tracking and 10-day always-on battery tomsguide.com, while calling the Ultra 3 an “excellent sports watch” with superb GPS that “matches [Fenix’s] key tracking features” albeit with shorter battery life tomsguide.com.
• Pricing & Availability: Apple Watch Ultra 3 starts at $799 in the US (approx. £799/€899) – holding last generation’s price – and ships Sept 19, 2025. Garmin Fenix 8 Pro is far pricier: $1,199 (47 mm) / $1,299 (51 mm) for the standard AMOLED models, and a whopping $1,999 for the MicroLED edition. In Europe, pricing ranges £1,029–£1,729 in the UK. Both are available in North America, EU and other major markets; Garmin’s LTE/satellite features require a monthly plan ($10+/month) after a trial period.
• Who They’re For: The Ultra 3 is ideal for everyday athletes and Apple devotees who want a rugged watch that doubles as a full-featured smartwatch – perfect for iPhone users balancing work, gym, and weekend adventures (and recreational divers up to 40 m). The Fenix 8 Pro targets hardcore adventurers and endurance athletes – think ultramarathoners, mountaineers, backcountry explorers – who demand multi-week battery life, granular training data, and off-grid navigation with reliable SOS, and are willing to invest heavily for it.

Hardware & Design

In contrast, the Garmin Fenix 8 Pro comes in two hefty case sizes – 47 mm and 51 mm – catering to those who prefer a larger watch face for visibility and battery capacity. Its construction emphasizes function over form: a fiber-reinforced polymer body with a steel or titanium bezel (depending on model) and sapphire crystal on premium versions. Visually, it’s the quintessential outdoors watch: round dial, five chunky side buttons, and a robust lug design. The Fenix is built to take a beating – 10 ATM water resistance (100 m) and MIL-STD durability are standard, and it’s often shown “in extreme conditions where athletes navigate deserts, climb mountains, or dive in the arctic,” as AppleInsider quipped (noting how Apple’s Ultra marketing mirrors Garmin’s adventurer imagery). One notable change in this generation: Garmin eliminated the smaller case size (previous Fenix “S” models ~42 mm) due to antenna space needs – a decision criticized since it leaves those with smaller wrists without a perfect fit. At 93 g (51 mm model, including band) the Fenix 8 Pro is substantially heavier than the 61 g Ultra 3 (case only), a trade-off for its larger battery and rugged build.

Both watches use sapphire glass on their displays for scratch-resistance (Apple’s Ultra has sapphire standard; Garmin offers sapphire on its Pro models). Apple’s titanium build gives the Ultra 3 a premium, corrosion-resistant finish, whereas Garmin’s use of DLC-coated titanium on some Fenix versions adds hardness and a tactical look. Each device exudes a “tool watch” aesthetic in its own way – the Ultra 3 with a modern, square-ish Retina display and customizable action button, and the Fenix 8 Pro with its classic round face, bezel etchings, and button-driven interface that Garmin purists love for reliability in rain or mud.

Display & Interface

Apple equipped the Ultra 3 with its largest and most advanced display ever: a 1.92″ LTPO 3 OLED panel that’s even larger (with 24% thinner borders) than the Ultra 2, yet fits in the same case. It’s an always-on Retina display that’s extremely bright (peaking ~3,000 nits like the Ultra 2) and now uses wide-angle OLED technology so it stays readable even at off-angles. In fact, Apple’s wide-angle design optimizes each pixel’s output at angle, meaning if you glance while biking or climbing, the screen remains crisp. The LTPO 3 tech also enables a clever 1 Hz to 1 s refresh upgrade – in always-on mode the Ultra 3 can refresh once per second (versus once per minute before), so second hands sweep continuously and data complications update in real-time without raising your wrist. It’s a vivid, color-rich touchscreen display, great for maps, notifications, and the new animated Waypoint watch face (which doubles as a live compass and even has a Night Mode). The downside of such a brilliant screen, historically, is battery life – but Apple mitigated that partially via a more efficient LTPO and a bigger battery, bumping the rated life to 42 hours normal use.

Garmin took a different, dual-pronged approach with the Fenix 8 Pro’s display. Standard Fenix 8 Pro models use an AMOLED screen (a shift from the transflective MIP of past Fenixes) with a brightness around 1,000–2,000 nits – “silly bright” by Garmin standards. Reviewers note it’s perfectly visible even under harsh sun (as seen with Garmin’s Epix and Venu series). This AMOLED comes in the two sizes (47 mm/1.3″, 51 mm/1.4″) and delivers rich color maps and smooth graphics. But Garmin’s headline was the introduction of a top-tier MicroLED model – the first smartwatch ever with a MicroLED display. That 51 mm Fenix 8 Pro MicroLED hits a blinding 4,500 nits brightness, claiming the title of “brightest display in a smartwatch anywhere”. It boasts over 400,000 tiny LEDs for unparalleled brightness and efficiency promises. In practice, early hands-on reports found it is incredibly bright and easy to read from all angles, but battery life suffers: ~10 days max (or just 4 days in always-on mode) on the MicroLED unit, versus 27 days (15 days AOD) on the 51 mm AMOLED model. Garmin itself admits MicroLED is a niche, pricey option ($2k) for those who demand the absolute best screen and are okay with halving their battery life.

Usability-wise, Apple’s watchOS interface is highly polished: smooth scrolling, touch gestures, and a deep app ecosystem. The Ultra 3’s UI benefits from the responsive S-series chip and 60 Hz refresh, making animations fluid. The Digital Crown lets you zoom/scroll precisely, and the Action Button can trigger custom shortcuts (like starting workouts or marking waypoints) – a big plus for athletes who want a one-press control. Garmin’s interface on the Fenix 8 Pro is a mix of physical and touch. The 5-button layout (Up, Down, Start/Stop, Back, Light) is favored in rough conditions, and now you can also use the touchscreen for map panning or quick menu selection. The menus and mapping aren’t as flashy as Apple’s, but they’re functional and have been refined over years of user feedback. One benefit: Garmin’s widgets and data pages are highly customizable; you can often see 6–8 stats at once in an activity, whereas Apple tends to show fewer metrics per screen (though you can swipe through multiple screens). In short, Apple’s display wins on richness and interface fluidity, whereas Garmin provides versatility – offering a bright, always-readable screen plus reliable button control and customization for serious training.

Battery Life

Battery endurance is a defining difference between these watches. The Apple Watch Ultra 3 sees an improvement over prior Ultras but still demands frequent charging compared to its Garmin rival. Apple advertises up to 42 hours on a full charge (typical use) and 72 hours in Low Power Mode – a notable bump that “makes it significantly more useful for weekend-long snowboarding or camping trips,” as Wired’s reviewer noted. This was achieved with a larger battery, more efficient display, and the new 5G modem’s power savings. In real terms, that means you can get about 1.5–2 days of heavy use (always-on display, workouts, GPS) or up to 3 days if you disable always-on and minimize usage overnight. For continuous GPS, the Ultra 3 can last around 20 hours in a special low-power workout mode with full GPS and heart-rate tracking – enough for an ultramarathon, but still relatively short for multi-day treks. Importantly, the Ultra 3 supports fast charging: ~12 hours of use from a 15-minute charge, which is great for a quick top-up before a long hike or after dinner.

The Garmin Fenix 8 Pro absolutely eclipses the Ultra on endurance. Thanks to its larger form factor (and absence of power-hungry apps or animations), the Fenix can go days or weeks without seeing a charger. The 51 mm Fenix 8 Pro is rated at 27 days in smartwatch mode (15 days with always-on display). Even the smaller 47 mm version manages about 15 days (8 days AOD) on a charge. This means you’re charging roughly once every 2–4 weeks, not days. For GPS activities, the gap widens: in the highest precision multi-band GPS mode, the 51 mm Fenix 8 Pro gets up to 53 hours (41 hrs with always-on) and the 47 mm about 30 hours. And if you use battery-saver GPS modes (UltraTrac or Expedition), the Garmin can stretch into multiple days of continuous tracking (up to 20+ days) for long expeditions. Such longevity is game-changing for ultra runners and thru-hikers – you can record a 100-miler or a week of hikes without worrying about charging. The new MicroLED model is the one exception: its battery life drops to ~10 days (or 4 days AOD) as mentioned, which is closer to a typical smartwatch. But most will opt for the standard AMOLED Fenix for maximum life.

In a direct test, after a full day including a marathon run, a reviewer found the Fenix 8 still at 84% battery while the Apple Ultra (previous gen) was at 67%, highlighting Garmin’s efficiency. In practice, Garmin’s endurance means you can track multi-day events or wear it on expeditions without carrying a charger, whereas the Apple will require that you plan for charging (e.g. using a power bank at base camp or nightly). That said, Apple’s 42+ hour span is a huge improvement over standard Apple Watches (and enough to finally do overnight sleep tracking without daily charging hassles). Many users report that Ultra 3 can “easily last two days including a marathon,” which is “impressive for a smartwatch with such a large and bright screen”. But when it comes to battery, Garmin comfortably holds the crown – Fenix 8 Pro is built for endurance first.

Health, Fitness and Sensors

Both the Ultra 3 and Fenix 8 Pro pack a comprehensive suite of sensors and fitness features, but each leans toward its parent ecosystem’s strengths: Apple doubles down on holistic health tracking and simplicity, while Garmin provides a deep toolbox for performance analysis.

Heart Rate & Biometrics: Each watch uses an advanced optical heart rate sensor for 24/7 HR and training zones. Garmin’s Elevate™ sensor (Gen 5) is known for improvements in accuracy, and Fenix 8 adds a bigger optical array that performed well in tests (it closely matched chest strap readings during steady runs). Apple’s HR sensor is high-quality too, but one marathon test showed the Ultra (Gen 2) initially struggled to lock onto HR during a race’s first half, reading erratically, before aligning with the Garmin later on. These optical quirks can happen with either brand, but Garmin tends to smooth or average the data, whereas Apple’s might spike or drop if it loses the pulse briefly. For critical medical metrics, Apple has a clear edge: the ECG sensor (electrocardiogram) on Ultra 3 can produce a 1-lead ECG and detect atrial fibrillation. Garmin has no ECG function in the Fenix 8 Pro. Apple also measures blood oxygen (SpO₂) on-demand and during sleep; Garmin does SpO₂ spot-checks and all-night PulseOx for altitude acclimation (useful for climbers), albeit at a battery cost.

Notably, Apple introduced a new hypertension notification feature. Using the optical HR sensor and machine learning, the Ultra 3 (and Series 11) analyze pulse wave patterns over weeks to alert you to possible chronic high blood pressure. It’s not a cuff or true BP reading, but it’s a “step in that direction,” catching trends that may prompt you to see a doctor. Garmin Fenix 8 Pro does not offer blood pressure monitoring. Apple also has a wrist temperature sensor (for cycle tracking and nightly temperature variance), an ambient noise monitor (to warn of loud environments), and advanced fall and crash detection that can call for help. Garmin covers safety via its incident detection and SOS, but doesn’t track ambient noise or skin temperature. It focuses on exercise metrics like heart rate variability (HRV) status (measured overnight) to inform recovery.

Fitness & Training Features: This is Garmin’s home turf. The Fenix 8 Pro is essentially a coach on your wrist. It computes VO₂ max for running and cycling, gives a Training Status (productive, maintaining, etc.), tracks Training Load over 7 days, and even offers a Training Readiness score each morning factoring sleep, HRV, recovery time, and acute load. It has modes for virtually every sport – trail running, ski touring, triathlon, rowing, strength, you name it – with specialized metrics like ClimbPro (which shows remaining ascent on hikes/rides), MTB Grit/Flow scores, and even surf and kiteboard tracking. For runners, Garmin introduced native running power from the wrist and has long included advanced dynamics (cadence, stride length, vertical oscillation – some require an optional HRM-Pro strap or footpod for highest accuracy). Apple has significantly closed the gap for casual athletes: WatchOS now supports running power (from the watch), cadence, stride length, ground contact time, and even a new track running mode that detects when you’re at a standard 400 m track and refines GPS accordingly wired.com. The Ultra 3 also added Swolf scores for swim efficiency (combining stroke count and time) wired.com, which Garmin has had for swimmers in its pool/open-water swim profiles.

Where Garmin still pulls ahead is analysis and planning. The Fenix 8 Pro provides on-watch turn-by-turn navigation with full-color topo maps preloaded (multi-continent, with points of interest, ski maps, etc.), and you can create courses or segment targets in Garmin Connect. It evaluates your efforts with Performance Condition (real-time fitness level during a run) and suggests daily workouts and race predictors. After workouts, it gives detailed breakdowns: aerobic/anaerobic Training Effect scores, primary benefit (e.g. “Tempo improving lactate threshold”), and recommended recovery hours. By contrast, Apple’s Fitness app keeps things simpler – it will show your heart rate zones, splits, VO₂ max trend, and awards, but not tell you if today was productive or how long to rest. It relies more on third-party apps (Strava, TrainingPeaks, etc.) for advanced analysis, whereas Garmin bakes it in.

That said, Apple’s ecosystem shines in all-around health and convenience. Ultra 3 integrates with Apple Health for a holistic view of activity, sleep, mindfulness, and even medication tracking. It now generates a Sleep Score based on sleep stages, duration and consistency, akin to Fitbit or Garmin’s sleep insights. Garmin also tracks sleep and will grade your sleep, but some find Apple’s new Sleep Score and coaching (like bedtime consistency reminders) more user-friendly. And if you’re an Apple Fitness+ subscriber, the Watch Ultra 3 can be your hub for guided workouts, with heart rate and rings synced to your iPhone/Apple TV screen. Garmin has no equivalent service, though it syncs nicely to platforms like Strava and offers challenges in Garmin Connect.

GPS Accuracy & Navigation: Both devices feature dual-frequency (L1/L5) GNSS for superb location accuracy even in GPS-challenged environments (cities with tall buildings, dense forests, canyons). Apple touts having “the most accurate GPS in a sports watch” with the Ultra 3, and indeed, tests have found the Apple Watch Ultra line extremely accurate. In New York City comparisons, the first Ultra drew impressively clean routes, nearly on par with or better than Garmin multi-band watches in certain segments. The London Marathon test cited earlier showed both Ultra 2 and Fenix 8 were almost spot-on, with Apple measuring 42.26 km vs Garmin’s 42.47 km for a 42.195 km race (Apple was a tad closer to the true distance). Another tricky section around tall buildings (Canary Wharf) had the Garmin track slightly more accurately than Apple, but differences were minor. In short, both watches deliver top-tier GPS precision, giving confidence for pacing and navigation. For backcountry use, Garmin has the advantage of onboard mapping – you can see your breadcrumb trail, follow routes, and use features like TracBack or NextFork (which tells distance to upcoming trail intersections). Apple’s Ultra 3 with WatchOS 10+ can finally use offline maps via Apple Maps (you can download regions on your iPhone and view them on the watch). This includes topographic detail for U.S. parks and the ability to mark waypoints or follow a preloaded GPX route using third-party apps. It’s a big step forward, but still not as robust or globally comprehensive as Garmin’s maps. Additionally, Garmin’s devices support multi-GNSS (GPS, GLONASS, Galileo, etc.) and an auto-select SatIQ mode to optimize battery by switching bands intelligently.

Other Sensors: Both have barometric altimeters for elevation, compass, gyroscope, accelerometer, and ambient light sensors. Garmin includes a thermometer for external temperature (useful to see how cold it is outside your jacket), while Apple uses its temperature sensor on the wrist mostly for health insights. Apple’s Ultra also has a U1 Ultra Wideband chip (2nd-gen) that can be used to precisely locate your iPhone or unlock your car (with supported digital keys). Garmin lacks UWB but does have ANT+ and Bluetooth sensor support – a big deal for triathletes/cyclists who pair power meters, cadence sensors, or smart trainers. (Apple added Bluetooth cycling sensor support in 2023, allowing the Ultra to pair with power meters and cadence sensors as well, but it doesn’t support ANT+ which many cycling accessories use.)

In summary, Apple Watch Ultra 3 offers a more well-rounded health monitoring suite (ECG, advanced heart alerts, etc.) and enough training features for most users, whereas Garmin Fenix 8 Pro is a data powerhouse for serious training and navigation. A sports medicine doctor or data-driven coach might prefer the Garmin’s metrics, while someone focusing on general wellness or using their watch for both fitness and everyday life might lean Apple. It often comes down to how deep you want to dive into the numbers – Garmin can quantify everything and give guidance, while Apple focuses on the key metrics and overall wellness (with an interface many find more approachable).

Smart Features & Ecosystem

One major reason many people choose Apple Watch – even an Ultra – is for its rich smartwatch functionality. The Ultra 3 is essentially a fully capable Apple Watch, meaning it can handle calls, texts, emails, app notifications, Siri voice commands, Apple Pay, music streaming, and a vast third-party app library. It runs watchOS (version 26 in 2025) which provides a smooth integration with the iPhone (note: Apple Watches only work with iPhones). This integration is seamless: your Apple Health and Fitness data sync to the phone, any apps like Uber, Spotify, or Strava have Watch counterparts, and you can even control smart home devices from your wrist. New in this generation, Ultra 3’s 5G connectivity offers faster data for things like downloading podcasts or maps on the go. And when off-grid, the Ultra 3’s unique satellite feature lets you still send out messages or emergency alerts directly from the watch, no phone needed. This includes integration with Apple’s Find My app for location sharing via satellite.

Garmin watches have historically been more limited in smart features, but the Fenix 8 Pro makes strides thanks to its new LTE and inReach connectivity. When paired with Garmin’s Messenger app and a subscription, the Fenix can send/receive texts and even make voice calls without a phone. However, this is done through Garmin’s system – for example, you can call other Garmin Messenger users or send them messages via the watch’s built-in mic/speaker, but it’s not like the watch gets a personal phone number for calling any line (it’s more akin to a push-to-talk or VoIP service within the Garmin app ecosystem). The Fenix also leverages LTE for live services: LiveTrack (friends/family can track your activity in real time) now works directly, and you can get basic weather updates on the watch without a phone. In terms of notifications, when the Fenix is paired to a phone (Android or iOS), it can display calls, texts, and app notifications just like the Apple Watch. Android users can even respond with preset replies or voice (Garmin enabled a voice assistant feature on some models, and here with the mic you can use voice commands for the watch’s functions or voice-to-text replies). Still, the experience is not as rich as Apple’s – there’s no on-watch app store with social or productivity apps (Garmin’s Connect IQ store has some apps and watch faces, but far fewer and more fitness-oriented).

Music and Payments: Both support onboard music storage and streaming. The Apple Watch Ultra can stream Apple Music or Spotify over Wi-Fi/5G or play stored playlists to your Bluetooth headphones. Garmin Fenix 8 Pro allows syncing playlists from Spotify, Amazon Music, etc., for phone-free listening, and with LTE it might even stream a bit (though Garmin hasn’t emphasized streaming, more offline playback). For payments, Apple has Apple Pay – widely supported for contactless payments globally. Garmin has Garmin Pay, which works too, though bank support can be spottier depending on your region (major banks are supported, but Apple Pay generally has broader acceptance).

Voice Assistants: Ultra 3 has Siri on the wrist – you can dictate messages, ask for directions, or control HomeKit devices. Garmin doesn’t have a native assistant, but if paired to an Android phone, you can long-press a button to invoke Google Assistant or Bixby through the watch (the Fenix 8’s mic will pick up your command and route it). On iPhone, Garmin can’t access Siri, so no voice assistant there.

Navigation and apps: Garmin’s strength is offline capabilities – you can navigate on the Fenix anywhere with no phone (all maps and routing on-watch). Apple relies on the phone for heavy map data (though offline maps can be preloaded now). If you need turn-by-turn driving directions or public transit info in a city, Apple Watch can do that via Apple Maps handoff from your phone; Garmin cannot. But for hiking, Garmin’s built-in POIs (summits, lakes, trailheads) and course navigation are extremely handy phone-free.

Ecosystem integration: If you live in Apple’s ecosystem (iPhone, Mac, etc.), the Ultra fits in naturally – unlocking your Mac, using as a viewfinder for iPhone camera, automatic fitness syncing to Apple Health, etc. Garmin’s ecosystem revolves around Garmin Connect, which is a robust fitness platform. It syncs your activities and wellness data to the Garmin Connect app and web dashboard, where you can analyze and also link out to third parties (Garmin can auto-sync runs to Strava, MyFitnessPal, TrainingPeaks, etc.). Garmin Connect lacks some of the lifestyle features of Apple (no native menstrual tracking or medication reminders, for instance, which Apple Health has), but it offers deep insight into training metrics. One plus: Garmin works with both Android and iOS – it’s platform-agnostic – which is great for Android users or those who might switch phones.

Unique new tricks: Apple’s Ultra 3 introduced new watch faces (e.g. the Waypoint face for adventurers) and gesture controls inherited from Series 10/11, like the Double Tap gesture to control the watch hands-free (e.g. answer a call or start a timer by tapping your thumb and forefinger). Garmin doesn’t have that, but it did add voice control for some actions – you can apparently use “phone-free voice commands” on the Fenix 8 Pro to start activities or control music, etc., which is novel for Garmin.

Overall, the Apple Watch Ultra 3 operates as a full smartwatch, doing all the daily tasks (texts, calls, Siri, apps, contactless pay) extremely well, while the Fenix 8 Pro is a smartwatch in a more limited sense – it covers the basics and adds some unique communication tools for adventurers, but it won’t replace your smartphone in the same way an Apple Watch can. If you want your watch to be an extension of your phone and life, Ultra is unmatched. If your priority is that your watch be an extension of your outdoor gear (and you’re okay with fewer “smart” bells and whistles), Fenix is built for that.

Real-World Performance & Expert Opinions

Early impressions from reviewers and athletes highlight that you can’t go wrong with either device’s core performance – but they excel in different areas:

• GPS & Tracking: Both watches have been praised for accuracy. Marathon runner and tech writer Nick Harris-Fry tested them head-to-head and said “their GPS accuracy particularly impressed me on a tricky course” like the London Marathon. He noted either watch could be relied on for pacing and that lap markers were spot-on thanks to dual-band GPS. When forced to choose a “winner” for GPS, he gave Apple the nod for one race (for slightly tighter distance tracking), but overall it’s essentially a draw in real use. The takeaway: navigation and distance tracking are rock-solid on both, even in city canyons or dense woods.
• Heart Rate & Training: In the same marathon test, Harris-Fry found the Garmin Fenix’s heart rate graph mirrored expectations (steady rise, matching past chest strap data), whereas the Apple Watch Ultra 2 missed a chunk of data early on and read too high until it corrected itself. After that, they matched closely. For him, Garmin won on HR accuracy over that race. This aligns with anecdotal reports that Garmin’s algorithms handle intense or interval changes a bit better, whereas Apple’s might occasionally lag or hiccup (though Apple’s sensors are generally very good for steady-state and daily monitoring).
• Battery & Endurance Use: Reviewers unanimously point out the Fenix’s huge battery advantage. “The Garmin Fenix 8 is my main sports watch and will remain so, partly because of its battery life,” Harris-Fry wrote. He observed that after his marathon and full day, the Fenix still had ample charge to last another week of recovery, whereas the Apple Watch would need charging in another day or so. Wired’s review likewise noted that the Ultra 3’s improved 42-hour battery “makes it significantly more useful… [for] camping trips,” but it’s still not multi-week like Garmin. In essence, for ultra-long events or expeditions, experts lean towards Garmin as the reliable choice – you’re not worrying about battery in the middle of nowhere.
• Day-to-Day Experience: Those coming from a smartwatch background often favor Apple’s user experience. For example, some tech reviewers mention enjoying the “smart” aspects of the Ultra – notifications that are actionable, being able to quickly dictate a message, the high-res display for checking emails or calendars. On the other hand, athletes who have used Garmin for years love the comprehensive data it provides. “I also enjoy the wealth of analysis [the Fenix] offers when training for a marathon,” Harris-Fry wrote. The training status, load focus charts, and recovery insights help guide serious training plans, which the Apple Watch doesn’t do natively.
• Ruggedness & Reliability: Both devices are extremely durable in testing. Ultra users have taken it on muddy trail runs, ocean dives, and high-altitude treks with no issues – the sapphire screen and titanium case resist scratches well (at most, cosmetic scuffs on the titanium). Garmin’s Fenix line has a long track record of toughness; the sapphire/dlc models in particular are very scratch-resistant. If anything, some note the Ultra’s glossy OLED screen can be harder to read in certain bright sunlight angles compared to Garmin’s transflective displays of old – but now that Fenix uses AMOLED, it too is a glossy display. Garmin mitigated this by cranking brightness, and with the MicroLED even more so. Real-world usage shows both screens are readable outdoors, but if you’re in glaring noon sun, the Fenix 8 Pro’s reflective screen (when backlight is off) or sheer nit output (when on) might have a slight edge in visibility.
• Expert Quotes: TechCrunch described Ultra 3 as a major upgrade after a gap year, adding “new satellite connectivity feature” plus the Series 11’s hypertension and sleep features. AppleInsider called it an “iterative yet necessary update” noting the display stretch and “incredible 42-hour battery life” as welcome improvements. Ray Maker (of DC Rainmaker), a renowned sports tech expert, gave a detailed first look at Fenix 8 Pro, highlighting that the release “is all about connectivity (and displays)” – with LTE and two-way satellite messaging the big additions. He did point out “some catches; most notably the disappearance of a smaller-sized Fenix” and the steep pricing, with the entry point now $1,199 for the base model. In his comments, he also noted the MicroLED’s battery trade-offs and cost: “I’d be hard-pressed to spend $2,000 on [MicroLED]… quite a letdown” one user replied, given the 4-day always-on life. These sentiments show that while Fenix 8 Pro is technologically impressive, even hardcore fans are wary of the price jump and missing smaller model.
• Satellite Messaging: This is a new frontier for wearables. Apple’s implementation on Ultra 3 leverages Globalstar satellites (like the iPhone 14/15’s Emergency SOS) – it’s primarily for emergency use, but Apple also enables Find My check-in and limited two-way texting to contacts when you have a compatible cellular plan. They are including 2 years of emergency SOS service free. Garmin’s inReach integration on Fenix 8 Pro is more mature in some ways: it allows custom two-way messaging to any phone/email via the Garmin Messenger network and interactive SOS with Garmin’s 24/7 emergency coordination center. This is a big plus for explorers – you’re not limited to just pre-set messages or emergency responders. However, Garmin requires a subscription plan (tiers depending on how many messages you send). Experts in the hiking/backpacking community are very excited about having inReach on a watch, since previously one had to carry a separate Garmin inReach device. This could be a life-saver – literally – for off-grid adventurers. The trade-off: you must manage that subscription and understand the limitations (satellite comms are slow and require line-of-sight and patience to connect).

In summary, experts praise the Apple Watch Ultra 3 for bringing Apple’s polish and ease-of-use to a rugged format, finally with enough battery and features to seriously consider for outdoor athletes. It’s viewed as the best “smartwatch that’s also a serious sports watch”. The Garmin Fenix 8 Pro continues to be lauded as the ultimate adventure watch, now with modern connectivity – albeit at a cost. As Tom’s Guide put it, “The Garmin Fenix 8 is one of the most expensive sports watches available, but also the best, in my opinion”, offering “accurate tracking and useful training analysis in an attractive watch that lasts 10 days… always-on.” tomsguide.com. Meanwhile, “Apple’s top smartwatch is also an excellent sports watch… It doesn’t have the battery or training analysis of the Fenix 8, but matches its key sports tracking features.” tomsguide.com. This nicely sums up the consensus.

Price, Value & Availability

The Apple Watch Ultra 3 and Garmin Fenix 8 Pro occupy the high end of the market, but Garmin’s pricing goes even higher – it’s a significant factor to consider:

• Apple Watch Ultra 3 is priced at $799 (US) for the single 49 mm model with cellular (cell connectivity is standard on Ultra). In Europe it’s around €899–929 and in the UK £799 (including VAT) for the base with an Alpine Loop or other band. Apple kept the price same as the Ultra 2, which is commendable given the added tech like satellite and 5G. At $799, the Ultra 3 undercuts Garmin’s flagship by a wide margin. It’s available through Apple stores and major retailers starting Sept 19, 2025, with pre-orders from Sept 9. Apple often offers a limited 1-year warranty (extendable with AppleCare+), and the Ultra is expected to have a strong resale value due to its popularity beyond just niche athletes.
• Garmin Fenix 8 Pro (AMOLED) starts at $1,199 for the 47 mm and $1,299 for the 51 mm in the US. UK pricing is £1,029/£1,119 respectively, and EU pricing around €1,199/€1,299 (Garmin often matches dollar and euro pricing one-to-one). These prices are presumably for the Sapphire editions (Garmin’s listing calls them “AMOLED Sapphire”) which include premium materials and maps. There may not even be a non-sapphire option this gen given the pricing – it seems all Fenix 8 Pro have sapphire glass and either steel or titanium bezels. The Fenix 8 Pro MicroLED 51 mm is a steep $1,999 (≈£1,729/€1,999), making it the priciest Fenix ever. Availability began September 2025; Garmin’s site indicated orders starting Sept 8 and shipping within a few weeks. Garmin typically provides a 1-year warranty as well, and these watches are built to last many years (software updates often extend 2–3 generations).

Value-wise, the Ultra 3 offers a lot at $799 – you get top-notch smartwatch capabilities and very competent adventure features. It’s a better value for someone who will use it everyday in all aspects (work, play, fitness). The Fenix 8 Pro is a considerable investment. You’re paying a premium for its extreme battery, mapping, and built-in satcom. For dedicated adventurers, that can be worth it – there’s peace of mind knowing your watch won’t die in the field and can send an SOS. But at $1.2k+, it’s over 50% more expensive than the Apple, and the MicroLED model costs as much as a high-end smartphone + the Ultra combined. Some reviewers have openly questioned if $2,000 for a smartwatch is justified when the battery gains of MicroLED didn’t pan out this time. It’s telling that just days after launch, Garmin offered small discounts on the MicroLED in some regions, hinting that demand may be limited to elite users.

In major markets: Both watches are available in the US, Canada, UK, EU, Australia, and so on. The Ultra 3 supports region-specific cellular bands and requires an iPhone with an appropriate carrier plan (for cellular and satellite messaging beyond emergency). Garmin sells the Fenix globally as well, but note the satellite features require service activation. Garmin’s inReach subscriptions have regional coverage (operating on the Iridium satellite network, which is truly global pole-to-pole) – plans can be activated in NA and many countries where Garmin has authorization, but a few countries restrict satellite comms devices. It’s wise to check Garmin’s coverage map if you plan to travel with it to remote areas.

One more consideration: ongoing costs. With Apple, emergency SOS via satellite is free for at least two years on the Ultra 3, but Apple hasn’t clarified if or what it will charge after – possibly they might bundle it or introduce a fee later. Non-emergency satellite texting on Ultra is likely tied to your cellular plan (e.g. it uses your iPhone/Watch plan to bill or requires an add-on). Garmin’s system definitely requires a subscription: the Freedom plan (monthly) or yearly plans ranging maybe $15 to $50/month depending on message allowance and SOS coverage. Garmin’s cheapest safety plan might be ~$15/month for unlimited SOS and a few preset texts, whereas a premium plan for unlimited messaging might be more. These costs add up, so factor that in if you intend to fully use the off-grid comm features.

For many users, a key question is: do you need to spend $1k+ on the Garmin, or will the $799 Apple suffice (or vice versa, if you’re an Android user, the Apple’s not even in play)? The answer depends on your use-case, which leads to…

Pros, Cons & Who Should Choose Which

Both the Apple Watch Ultra 3 and Garmin Fenix 8 Pro are phenomenal, but each has distinct strengths. Here’s a rundown of pros and cons to help different types of users decide:

Apple Watch Ultra 3 – Pros:

• Superior Smartwatch Experience: As “Apple’s top smartwatch”, the Ultra 3 handles calls, messages, voice assistant (Siri), and apps with ease tomsguide.com. The interface is polished and intuitive, making it great for daily wear beyond workouts.
• Health Monitoring & Safety: Offers ECG, irregular heart rhythm and blood oxygen alerts, new hypertension notifications (a unique health insight), and fall/crash detection that can auto-call help (even via satellite if off-grid). It’s like having a mini health guardian on your wrist.
• Bright, Beautiful Display: The OLED Retina display is large, colorful, and now even brighter at angles – fantastic for at-a-glance info and mapping. It’s arguably more attractive for everyday watch faces and notifications than Garmin’s display.
• Rugged Yet Stylish: Built tough with titanium and sapphire, but sleek enough to wear to the office or a dinner. It balances adventure and elegance (swapping bands can dress it up or down).
• Fast Charge & 5G: Charging is quick, mitigating the battery issue to a degree, and 5G connectivity means snappier data and future-proofed networking.
• Diving and Water Sports: The only one of the two that’s a certified dive computer for recreational SCUBA (with the Oceanic+ app) – huge pro for divers. Plus, the new Waypoint face and Night Mode are great for navigation in low-light or underwater scenarios.

Apple Watch Ultra 3 – Cons:

• Battery Life (Compared to Garmin): Still needs charging every couple of days. Heavy GPS use or multi-day trips require carrying a charger or battery pack, which hardcore outdoors folks may find inconvenient (Garmin’s multi-week life spoils you).
• Ecosystem Lock & Compatibility: Only works with iPhone. Android users can’t use it at all. Also, to fully enjoy it, you often need the Apple ecosystem (Apple Music, Fitness+, etc.), which may not appeal to everyone.
• Pricey (though less than Garmin): $799 is expensive in general smartwatch terms, and there’s only one model – no smaller, cheaper variant. If you don’t need all its rugged features, an Apple Watch Series model could be more cost-effective.
• Less Specialized Training Tools: No native recovery advisor, training load charts, or coaching insights like Garmin provides. Serious athletes can compensate with third-party apps, but it’s not as turnkey for training periodization or complex workouts.
• Bulky for Small Wrists: The 49 mm case is large. It looks great on medium to large wrists, but on very small wrists it can be a bit cumbersome (though some smaller-framed people do wear it fine). Garmin at least used to offer smaller versions (though not in this gen).
• Subscription for Full Features: After the initial free period, some advanced services (satellite messaging beyond SOS, maybe Fitness+ training content) could require subscriptions.

Garmin Fenix 8 Pro – Pros:

• Unrivaled Battery Life: This is the watch for endurance. As one user put it, it’s amazing to get “15 days in AOD and 27 days in gesture” on the 51 mm model. Multi-day races, backcountry trips, or simply not worrying about nightly charging – huge quality of life for adventurers.
• Pro-Grade Training Features: A paradise for data nerds and serious athletes. Detailed metrics, training suggestions, recovery time, HRV status, altitude and heat acclimation – it’s like having a coach and sport lab on your wrist. It truly helps optimize training and understand your performance.
• Offline Maps & Navigation: Full-fledged navigation capabilities with topo maps, turn-by-turn on trails, and the ability to plan routes on the watch. You can leave your phone behind and still find your way through wilderness or city streets with confidence.
• Satellite & SOS Integration: Peace of mind for explorers – with built-in inReach tech, you have a safety line anywhere on Earth. You can send an SOS that Garmin’s IERCC will respond to, or just check-in with family when off grid. It’s a major differentiator for those who often venture beyond cell service.
• Durability & Tactical Features: It’s built like a tank. Sapphire models resist scratches incredibly well; many military and search-and-rescue folks trust Fenix. Plus, specialized modes (Tactix edition features like night vision mode, stealth mode, dual-position GPS format, etc., if you get that variant) can cater to tactical or mission-based use.
• Multi-Platform and Accessory Support: Works with iOS or Android, which is a plus for flexibility. Also supports ANT+ and BT sensors – from cycling power meters to cadence pods to Garmin’s own Running Dynamics Pod – giving athletes a broad range of accessory integration Apple can’t match.

Garmin Fenix 8 Pro – Cons:

• High Cost: Simply put, it’s very expensive. Starting at ~$1200 and reaching $2000, it’s an investment usually justified only if you truly use the advanced features and extreme battery. For many casual users, that price is overkill when cheaper models or the Apple Watch exist.
• Less “Smart” and Noisy Notifications: While it shows notifications, you can’t do as much with them. Responding to messages is limited (especially on iPhone), and you won’t be reading emails or scrolling Twitter on a Fenix. The Connect IQ app selection is minuscule next to Apple’s App Store. If you expect a mini-phone on your wrist, Fenix will disappoint.
• Size and Weight: These watches are large and can be heavy (the 51 mm sapphire is 93 g with band). Some find it chunky or uncomfortable for sleep (Garmin does have a new slim Index Sleep wearable for those who don’t want to wear a big watch to bed). The lack of a smaller Fenix 8S Pro option this generation means some people, especially women with smaller wrists, might find it too bulky day-to-day.
• Display Trade-offs: The AMOLED (and MicroLED) displays are beautiful, but still not as high-DPI or smooth as Apple’s Retina (Garmin’s UI elements can appear less refined). Also, the strategy to offer MicroLED at extra cost turned off some fans since its battery life wasn’t the leap hoped for. And if you use always-on mode, the Fenix’s advantage diminishes a bit (15 days AOD on 51 mm is fantastic, but not the 27 days in raise-to-wake).
• Complexity: The plethora of features can be overwhelming. Garmin’s menu system is deep; new users might need a week or two to fully learn their Fenix. Apple’s device, conversely, is pretty easy out-of-box. So there’s a steeper learning curve to exploit all of what Fenix offers.
• Subscription Required for LTE/InReach: To use the headline features (calls, texts, SOS on Fenix), you must pay for Garmin’s subscription after the trial. This is an ongoing cost which, while justifiable for frequent adventurers, means you don’t get to use those features free indefinitely. Apple’s emergency SOS is free for at least two years and uses your existing cell plan for other satellite messages.

Best For…

• Ultra 3: Choose the Apple Watch Ultra 3 if you are an iPhone user who wants a watch that can do it all. It’s best for everyday fitness enthusiasts, weekend warriors, and tech-savvy adventurers. If you split your time between the office and outdoors, the Ultra transitions perfectly. It’s also great for divers (casual diving and snorkeling), road runners, gym-goers, and general health tracking. If you value things like a high-res display, seamless music streaming, mobile payments, and the comfort of Apple’s UI – and you go on hikes or runs that are under 12 hours at a time – the Ultra 3 will likely delight you. It’s the better choice too if you need advanced health features (ECG, cycle tracking, etc.) or if you simply don’t want to charge a watch every day but don’t mind every 2–3 days.
• Fenix 8 Pro: Go with Garmin’s flagship if you are a dedicated outdoor adventurer or endurance athlete who pushes the limits. It’s tailor-made for ultramarathon runners, trail runners doing 100K/100mi races, mountaineers, thru-hikers, backcountry hunters, expedition adventure racers, and anyone who lives off-grid for days or weeks. If you do multi-day ultras (24h+ events), multi-day treks, or expeditions where charging is impractical, the Fenix’s battery is a godsend. It’s also ideal for data-driven triathletes and cyclists – especially if you use power meters or want all your training load stats in one place. Furthermore, if you don’t use an iPhone or prefer not to be tied to one brand’s ecosystem, Garmin gives you freedom. Finally, for those who consider their watch a critical safety tool (climbers, guides, search-and-rescue personnel), the Fenix with inReach can literally be a lifeline. You’ll pay a premium, but for these use cases, it often pays for itself in performance and reliability.

It’s worth mentioning there are alternative options if you fall somewhere in between. For instance, if you love Garmin’s approach but not the price or bulk of the Fenix 8 Pro, Garmin’s own Forerunner series or the prior Fenix 7/7S/7X Pro are still excellent and more affordable (and many of their new software features trickled down via updates). Likewise, if you want an Apple Watch but don’t need the Ultra’s rugged features, the Apple Watch Series 11 (or upcoming Series 12) offers the new hypertension and Sleep Score features and a full smartwatch experience at almost half the price (though with much shorter battery and less durability).

Other Notable Competitors & Upcoming Releases (2025)

The premium adventure watch segment is heating up, and both Apple and Garmin have spurred competitors and new releases worth noting:

• Garmin Enduro 3: Garmin is rumored to launch or have launched the Enduro 3, a successor to its ultra-endurance watch line. The Enduro models (Enduro 2 was released in 2022) prioritize battery above all, often by using Power Glass solar charging and a lower-power display. If Enduro 3 arrives, expect even longer battery life than Fenix 8 Pro – potentially 30–40% more – making it a top pick for ultra runners and expeditioners willing to sacrifice some smart features. It likely won’t have AMOLED; instead a memory-in-pixel screen to stretch weeks of use, and possibly omit maps or music to save power (previous Enduro did). For those planning multi-week adventures like thru-hikes (e.g., Appalachian trail segments), Enduro is worth watching.
• Garmin MARQ (Gen 3 or Gen 4): Garmin’s luxury line, MARQ, which wraps Fenix-level tech in luxury materials (titanium, ceramic, sapphire) and classic styling, was last updated in late 2022. By late 2025 or 2026 we might see a new generation MARQ with Fenix 8 Pro internals (LTE, MicroLED perhaps) in a more refined package. This is for consumers who want the rugged tech but in a boardroom-suitable look (and are ready to spend ~$2,000). It’s a niche but noteworthy for completeness.
• Apple Watch Series X / Series 12: Apple celebrated 10 years of Apple Watch in 2025. There were reports of an “Apple Watch X” concept (for the 10th anniversary) possibly introducing a new design or MicroLED display, but as of the Ultra 3 launch, Apple stuck with incremental improvements. Looking ahead, Apple is heavily rumored to be developing MicroLED displays for Apple Watch – this could land in an Apple Watch Ultra 4 in 2026 or so, potentially giving Apple a display tech leap that matches or surpasses Garmin’s. If you’re an Apple fan looking for the next big thing, keep an eye on those reports – a future Ultra might combine MicroLED efficiency with Apple’s silicon to greatly improve battery life (maybe finally hitting that 3–4 day regular use mark which would be a big deal). In the near term, the 2026 Series 12 or Ultra 4 could also bring new health sensors (blood glucose monitoring is the holy grail but likely still years away).
• Samsung and Google: In the broader smartwatch arena, Samsung’s Galaxy Watch 8 (expected late 2025) and Google’s Pixel Watch 3 or 4 are competitors on the “smart” side. Samsung’s watches (running Wear OS with Samsung flavor) are polished and have good fitness tracking (including a new “AI coach” on the GW8 rumored), but they can’t touch Garmin or Apple for extreme sports – battery life is closer to Apple’s (1–2 days) and ruggedness is around 5 ATM water resistance. However, for Android users not needing an expedition watch, a Galaxy Watch is a strong all-around choice, especially now that some rumors suggest new AI features and perhaps satellite SOS (Samsung has discussed adding satellite emergency to Galaxy watches, which would follow Apple’s lead). Google’s Pixel Watch 2 (late 2024) improved battery slightly and health sensors (with Fitbit integration), and a Pixel Watch 3 in 2025 might continue that trend, but Pixel is more a competitor to Apple Watch Series models – not in the same durability/battery class as Ultra or Fenix.
• Suunto and Coros: Among specialized sports watch makers, Suunto launched the Suunto Race 2 in August 2025, a high-end multi-sport watch with a bright 1.5″ AMOLED display, 115+ sport modes, offline maps, and up to 55 hours GPS battery. Suunto, known for its heritage in outdoor instruments, is positioning Race 2 as a serious alternative for endurance athletes who want something different from Garmin. It may not have the smartwatch frills, but it’s slightly more affordable than Fenix and offers solid mapping and training features (plus Suunto’s app which some prefer for simplicity). Coros, another rising player, is expected to release the Vertix 3 by late 2025. Coros Vertix watches target the mountaineering and ultra crowd – the Vertix 2 had 60 days standby and 140 hours GPS battery in one mode. The Vertix 3 might come in both MIP and AMOLED versions to cater to different preferences. For athletes who want very long battery and are okay with a less-established ecosystem, Coros is often praised for its accuracy and no-frills approach (pro ultrarunner Kilian Jornet famously wore a Coros).
• New Garmin Models: Within Garmin’s own lineup, two interesting releases: the Garmin Venu X1 (2025) which is a lifestyle AMOLED watch, slim with a big display – more of an Apple Watch alternative with Garmin DNA tomsguide.com. And a leak about Garmin possibly preparing two new fitness watches soon (Tom’s Guide speculated maybe a new Forerunner or another Venu) shows Garmin’s not slowing down. Specifically, a Forerunner 980 could be on the horizon to replace the 970, offering a lightweight option with many Fenix features but in plastic. Also the Instinct 3 is anticipated for 2025 – Garmin’s Instinct line is like a baby Fenix with a monochrome display and even longer battery (solar charging, etc.) at a lower price. Instinct 3 would likely appeal to those who want rugged and long-lasting but simpler and cheaper (maybe ~$350). And for the tactically inclined, a Tactix 8 (basically a Fenix 8 in black stealth design with night vision mode) is listed in Garmin’s 2025 roadmap as well.

In short, 2025 is a great year to be in the market for a high-end sports watch. Apple and Garmin are leading the charge, but we see others like Suunto pushing back with their own AMOLED mapping watch, and even Amazfit (lower end but mentioned in passing for their T-Rex Ultra, etc.) trying to capture the rugged smartwatch niche (though not nearly as sophisticated). As technology like satellite comm and MicroLED displays become more common, we can expect these previously distinct categories – smartwatch vs. adventure watch – to continue merging. The Ultra 3 and Fenix 8 Pro are the clearest example: one is a smartwatch beefed up for adventure, the other an adventure watch beefed up with smart connectivity.

Conclusion

The Apple Watch Ultra 3 vs. Garmin Fenix 8 Pro isn’t a fight to the death – it’s more like two champion athletes excelling in slightly different arenas. The Ultra 3 is the all-rounder, bringing Apple’s renowned user experience to a durable, feature-packed device that now confidently handles marathons, mountain hikes, and dives while keeping you connected and safe. The Fenix 8 Pro is the specialist, engineered to support extraordinary feats of endurance and exploration with minimal compromise – it’s the watch you want when you’re a hundred miles from civilization or pushing your body to its limits in training.

To sum it up in a sentence: If you want a rugged watch that’s as smart as a phone and helps keep you healthy day-to-day, go Ultra 3 tomsguide.com; if you need a bombproof expedition partner with epic battery life and coaching prowess, go Fenix 8 Pro tomsguide.com. Either way, these two represent the pinnacle of smartwatch and sportwatch innovation in 2025, and they’re closer than ever in bridging the gap between everyday smartwatch and true adventure tool.

As one expert who tested both noted, “Come race day, I’d be delighted to rely on either of these watches to help me get round the course.” – a testament to how far wearables have come. Whether you’re summiting peaks, running ultras, or just navigating an urban jungle, the choice between Apple Watch Ultra 3 and Garmin Fenix 8 Pro ultimately comes down to your lifestyle and which set of strengths aligns more with your adventures.

Sources: Apple (Keynote announcements, Newsroom); TechCrunch; Wired; AppleInsider; DC Rainmaker; Tom’s Guide (hands-on reviews) tomsguide.com tomsguide.com; Garmin documentation and REI specs; Suunto Press; and expert commentary as linked above. Each feature and comparison point is backed by these reputable sources to ensure accuracy and the latest information as of September 2025.