Apple Watch Ultra 2 vs Garmin Fenix 8: which holds up better outside the Apple ecosystem
Honest comparison between Apple Watch Ultra 2 and Garmin Fenix 8: battery life, GPS, durability and compatibility with iOS and Android to help you choose wisely.
If you’re looking at a high-end sports watch in 2024, you’ve probably already come across the two usual suspects: the Apple Watch Ultra 2 and the Garmin Fenix 8. Both cost around (or more than) 900 €, both promise extreme durability, and both target someone who does more than go for a stroll on Sundays.
The real difference comes down to two points Apple doesn’t highlight on its official page: battery life and which phone they work with. Let’s get straight to it.
Why this comparison matters in 2024
The Apple Watch Ultra 2 launched in September 2023 and remains Apple’s flagship sports watch. The Garmin Fenix 8 arrived in August 2024 with AMOLED, speaker, microphone and diving down to 40 meters. It’s the first time Garmin has taken direct aim at the Ultra’s territory: a bright touchscreen, “smart” features and a comparable price.
If you have an iPhone, the choice is no longer automatic. And if you have Android, the Ultra 2 isn’t even on the table.
Compatibility: the filter that decides before the specs
Let’s start with what many comparisons bury in paragraph 15. The Apple Watch Ultra 2 only works with an iPhone. You need an iPhone XS or later running iOS 17 (or higher) to pair it. There is no official Android app, and there never will be.
The Garmin Fenix 8 is platform-agnostic. It connects to iOS and Android via Garmin Connect. It syncs workouts, notifications, music and payments (Garmin Pay) with either. Switch from an iPhone to a Pixel 9 and you won’t lose your history or settings.
For many people, this alone settles the debate. If you change phones often or live with two ecosystems, the Ultra 2 is not an option.
Real battery life: where Garmin plays in a different league
The official numbers:
- Apple Watch Ultra 2: 36 hours in normal use, 72 hours in low power mode.
- Garmin Fenix 8 AMOLED 47 mm: up to 16 days in smartwatch mode, 27 hours with multiband GPS + music.
In real use with continuous GPS active, the Ultra 2 lasts between 10 and 12 hours if you keep the always-on display enabled and use third-party apps such as Strava. The Fenix 8, under the same conditions, easily reaches 24–27 hours.
For a marathon, both are more than enough. For a 100 km ultra, a full Ironman or a multi-day trek, there’s no comparison: Garmin.
GPS and accuracy: multiband on both, with different nuances
Both incorporate multiband GPS (L1 + L5). In open terrain, accuracy is practically identical.
In difficult areas (urban canyons, dense forest, mountains with cliff walls), independent tests by DC Rainmaker and The5krunner show the Fenix 8 being slightly more stable on long tracks, while the Ultra 2 offers very good accuracy but with higher consumption. Neither one disappoints.
Practical difference: on Garmin you can load complete topographic maps in advance and navigate without a phone. On the Ultra 2 you rely on apps such as WorkOutDoors or Apple’s Maps, which work but don’t match Garmin’s outdoor cartography.
Durability and construction
The Ultra 2 case: grade 5 titanium, flat sapphire crystal, 49 mm, 61.4 g. WR100 water resistance (100 m) and MIL-STD-810H certification. Recreational diving down to 40 m with the Oceanic+ app.
The Fenix 8 case (47 mm AMOLED version): titanium bezel, sapphire crystal, 60 g. 10 ATM water resistance. Diving down to 40 m with the native Garmin Dive app, without relying on third parties.
Both withstand the same rough treatment. The Fenix adds five physical buttons, which in winter with gloves or in the rain are much more practical than the Ultra’s Digital Crown and Action button.
Display
- Ultra 2: LTPO OLED 502×410, 3000 nits peak brightness, 1 nit minimum.
- Fenix 8 AMOLED 47 mm: AMOLED 416×416, around 2000 nits, touch + buttons.
The Ultra 2 wins on brightness and image quality for notifications, photos and apps. The Fenix 8 has made a huge leap over the Fenix 7 and its display can no longer be criticised. If you’re coming from a regular Apple Watch, you’ll find the Ultra 2’s interface more “modern”. If you’re coming from another Garmin, the Fenix 8 feels snappier than ever.
Sensors and health
Both measure optical heart rate, SpO2, ECG, skin temperature and sleep cycles. Apple adds sleep apnea detection (with watchOS 11) and the Health app ecosystem, which remains among the best if you live on an iPhone.
Garmin leans more toward sports metrics: Training Readiness, Body Battery, VO2 Max per activity, estimated lactate threshold tests, recovery after workouts. For a serious runner or cyclist, Garmin Connect’s data is more actionable than Apple’s.
For general health, Apple. For structured sports performance, Garmin.
Software and third-party apps
watchOS 11 on the Ultra 2 has the full App Store: Strava, Komoot, TrainingPeaks, offline Spotify, WhatsApp, Slack. If you use the watch as an extension of your iPhone, there’s no comparison.
The Fenix 8 has Connect IQ, with Spotify, Amazon Music, Deezer and sports apps. More limited in general-purpose apps, but it covers what matters for training.
Calls and Siri on the Ultra 2 work natively. The Fenix 8 introduces a speaker and microphone: you can take calls via your phone and use voice assistants. A real novelty, not just marketing.
Price (checked on apple.com/es and garmin.com/es, November 2024)
| Model | Official RRP |
|---|---|
| Apple Watch Ultra 2 (49 mm, titanium) | 909 € |
| Garmin Fenix 8 AMOLED 47 mm | 999 € |
| Garmin Fenix 8 Solar Sapphire 51 mm | 1,199 € |
On Amazon Spain and El Corte Inglés the Ultra 2 has dropped to 799–829 € on several occasions during 2024. The Fenix 8, being newer, keeps its RRP.
Summary table
| Apple Watch Ultra 2 | Garmin Fenix 8 (47 mm AMOLED) | |
|---|---|---|
| Compatibility | iOS 17+ only | iOS and Android |
| Smartwatch battery life | 36 h | Up to 16 days |
| Multiband GPS battery life | ~10–12 h real-world | ~24–27 h |
| Display | OLED 3000 nits | AMOLED ~2000 nits |
| Diving | 40 m (Oceanic+) | 40 m (native) |
| Offline maps | Via apps | Native topographic |
| Weight | 61.4 g | 60 g |
| Price | 909 € | 999 € |
Who each one is for
Apple Watch Ultra 2 if:
- You have an iPhone and don’t plan to switch.
- You also use the watch for notifications, payments, messages and everyday apps.
- Your workouts last less than 6–8 hours.
- You value integration with the Health app and the Apple ecosystem.
Garmin Fenix 8 if:
- You use Android, or switch between iOS and Android.
- You do long workouts: ultras, treks, expeditions, triathlons.
- You want preloaded topographic maps and serious navigation without a phone.
- You prioritise sports metrics and training planning.
- You don’t want to charge your watch every two days.
Neither is “better” in the abstract. The Ultra 2 is a premium smartwatch with very solid sports capabilities. The Fenix 8 is a premium sports watch with very decent smart features. The order of the words matters, and it defines who each one suits.
