Garmin Fenix 8 vs Apple Watch Ultra 3
Verdict: Garmin Fenix 8 outperforms on battery endurance and specialized athletic metrics according to reviews from DC Rainmaker and Runner's World, while Apple Watch Ultra 3 wins on display brightness and iOS integration per CNET and MKBHD tests. The Fenix 8's 29-day battery and advanced GNSS give it a clear edge for serious athletes, though the Ultra 3's 3000-nit screen and fast charging make it more practical for mixed daily use. Overall the Garmin for the stated endurance focus.
Winner: Garmin Fenix 8
Garmin Fenix 8: 8.5/10
Apple Watch Ultra 3: 8/10
Spec-by-spec comparison
| Garmin Fenix 8 | Apple Watch Ultra 3 | |
|---|---|---|
| display | 1.3-inch AMOLED or MIP, 2000 nits | 1.9-inch Always-On Retina LTPO OLED, 3000 nits |
| battery_life | Up to 29 days smartwatch mode | Up to 36 hours typical use |
| gps | Multi-band GNSS with SatIQ | Precision dual-frequency GPS |
| sensors | ECG, pulse ox, HRV, skin temp, barometer | ECG, blood oxygen, temperature, depth gauge |
Garmin Fenix 8
What works
- Exceptional multi-day battery life with solar options
- Advanced multi-sport training metrics and recovery insights
- Rugged build with dive-rated water resistance
What doesn't
- Higher price point starting around $1000
- Less seamless smartphone integration than Apple ecosystem
Apple Watch Ultra 3
What works
- Brightest display with excellent outdoor visibility
- Deep Apple ecosystem integration and apps
- Fast charging and precise health tracking
What doesn't
- Battery requires daily charging for most users
- Less specialized for ultra-endurance sports metrics
Bottom line
Our pick: Garmin Fenix 8. It edges out the alternative on exceptional multi-day battery life with solar options. That said, Apple Watch Ultra 3 still wins on brightest display with excellent outdoor visibility — consider it if that single trade matters most for your use.
View full comparison on GoodPickr
Related Comparisons
- Withings Body Comp vs Garmin Index S2
- Google Pixel Watch 4 vs Samsung Galaxy Watch 9
- Fitbit Charge 7 vs Apple Watch SE 2nd Gen
- Garmin Forerunner 965 vs Whoop 5.0
- Apple Watch Ultra 3 vs Garmin Fenix 9
- Garmin Approach S70 vs Bushnell Ion Elite Gps Watch
- Samsung Galaxy Watch 7 vs Google Pixel Watch 3
- Garmin Fenix 8 Solar vs Apple Watch Series 10
- Apple Watch Ultra 3 vs Garmin Epix Pro Gen 2 51mm
- Whoop 5.0 vs Apple Watch Ultra 3
- Apple Watch Series 10 vs Samsung Galaxy Watch 7
- Apple Watch Ultra 3 vs Samsung Galaxy Watch Ultra
People also compared
GoodPickr · Data-backed product comparisons