Apple Watch Ultra 2 vs Garmin Forerunner 255
The Verdict
Apple Watch Ultra 2 and Garmin Forerunner 255 serve fundamentally different athletes. Ultra 2 dominates with a stunning 3000-nit LTPO2 OLED display, advanced health sensors (ECG, skin temperature), and 36-hour battery with 72-hour Low Power Mode. Its titanium construction and EN13319 dive certification justify the premium for extreme sports enthusiasts. Forerunner 255 weighs just 49g versus Ultra 2's 61.4g and delivers exceptional value at $349. Its MIP display excels outdoors, battery stretches 14 days in smartwatch mode, and GPS endurance hits 30 hours, making it ideal for distance runners and multi-sport athletes prioritizing longevity over feature density. Ultra 2 lacks cellular disadvantage compared to Forerunner 255's standalone GPS, but Apple's ecosystem integration and richer software experience justify premium pricing for iPhone users. Choose Ultra 2 if you demand cutting-edge health monitoring and water sports capabilities; pick Forerunner 255 if you're a dedicated runner wanting weeks between charges and proven training analytics at half the cost.
Who Should Buy
Buy the Apple Watch Ultra 2 if…
- →Extremely bright 3000-nit display readable in direct sunlight
- →Rugged titanium case with MIL-STD certification and dive certification to 40m
- →Best-in-class battery life for an Apple Watch at up to 36 hours
Buy the Garmin Forerunner 255 if…
- →14-day battery life means weekly charging at most
- →Multi-band GPS for exceptional outdoor tracking accuracy
- →Morning Report with daily training readiness and HRV status
Category Scores
Pros & Cons
Apple Watch Ultra 2
Pros
- Extremely bright 3000-nit display readable in direct sunlight
- Rugged titanium case with MIL-STD certification and dive certification to 40m
- Best-in-class battery life for an Apple Watch at up to 36 hours
- Dual-frequency precision GPS (L1 + L5) for accurate tracking
- On-device Siri processing and double-tap gesture via Apple S9 chip
Cons
- Very expensive at $799 starting price
- Only one large 49mm case size, too big for smaller wrists
- Still requires daily charging for heavy users
- No blood oxygen feature on units sold in the US (post-ban)
- Locked into the Apple ecosystem, requires an iPhone
Garmin Forerunner 255
Pros
- 14-day battery life means weekly charging at most
- Multi-band GPS for exceptional outdoor tracking accuracy
- Morning Report with daily training readiness and HRV status
- Race Predictor estimates finish times for 5K to marathon
- Lightweight at 49 g and comfortable for 24/7 wear
Cons
- MIP display lacks the vibrancy of AMOLED competitors
- No touchscreen on base model — button-only navigation
- No ECG or blood pressure monitoring
- Limited smart features compared to Apple Watch or Wear OS
- Third-party app ecosystem is small
Full Specifications
| Spec | Apple Watch Ultra 2 | Garmin Forerunner 255 |
|---|---|---|
| Software | watchOS 10 | Garmin proprietary OS |
| Body | ||
| Weight | 61.4 g | 49 g |
| Case material | Titanium | Fiber-reinforced polymer |
| Water resistance | WR100 (100m) + IP6X dust + EN13319 dive certified | 5ATM |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 36 hours normal use, up to 72 hours in Low Power Mode | Up to 14 days (smartwatch), 30 hrs GPS |
| Display | ||
| Size | 49mm | 46mm |
| Type | LTPO2 OLED Always-On Retina, up to 3000 nits | MIP (Memory-in-Pixel) transflective |
| Always-on display | ||
| Resolution | 502 x 410 | 260 x 260 |
| Processor | ||
| RAM | 1 GB | — |
| Chipset | Apple S9 SiP (64-bit dual-core) | Garmin custom SoC |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.3 | 5.0 |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
Explore more in smartwatches, see all Apple products or all Garmin products. View full details for the Apple Watch Ultra 2 or the Garmin Forerunner 255.