Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - Fenix 8 (47mm) | Huawei - Watch Ultimate |
|---|---|---|
| Battery life | 384 h | 336 h |
| Display size | 1.4 " | 1.5 " |
| Weight | 73 g | 76 g |
Between the Fenix 8 (47mm) and Watch Ultimate, the Fenix 8 (47mm) comes out ahead in battery life / weight, while the Watch Ultimate wins on display size. Overall, the Fenix 8 (47mm) scores 71.9 and the Watch Ultimate scores 71.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (71.9 vs 71.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Fenix 8 (47mm) if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery life, weight. The single most decisive one: Battery life — 14.29% more. 384 h vs 336 h.
Pick the Watch Ultimate if you care most about display size. Its strongest claims are display size. The single most decisive one: Display size — 7.14% more. 1.5 " vs 1.4 ".
Both ship with comparable ecg, cellular, spo2, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Garmin - Fenix 8 (47mm) or Huawei - Watch Ultimate?
Garmin - Fenix 8 (47mm) leads the current Mars Score by 0.4 points.The more useful decision is the trade-off behind that result: compare display size, battery life against the way you will actually use the product.
Choose Garmin - Fenix 8 (47mm) if…
Garmin - Fenix 8 (47mm) has the measurable edge on battery life h, weight g.
Choose Huawei - Watch Ultimate if…
Huawei - Watch Ultimate has the measurable edge on display size in.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Garmin - Fenix 8 (47mm) wins
- ▲Battery life — 14.29% more. 384 h vs 336 h.
- ▲Weight — 3.00 g less. 73 vs 76.
Why Huawei - Watch Ultimate wins
- ▲Display size — 7.14% more. 1.5 " vs 1.4 ".
Spec comparison
Design
| Spec | Garmin - Fenix 8 (47mm) | Huawei - Watch Ultimate |
|---|---|---|
| Case size | 47 mm | 48.5 mmlead |
| Weight | 73 glead | 76 g |
| Case material | fiber-reinforced polymer | titanium |
| Water resistanceⓘ | 10 ATM | 10 ATM |
Display
| Spec | Garmin - Fenix 8 (47mm) | Huawei - Watch Ultimate |
|---|---|---|
| Display size | 1.4 " | 1.5 "lead |
| Always-on display | true | true |
| Peak brightnessⓘ | 1000 nits | 1000 nits |
Health & Fitness
| Spec | Garmin - Fenix 8 (47mm) | Huawei - Watch Ultimate |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Garmin - Fenix 8 (47mm) | Huawei - Watch Ultimate |
|---|---|---|
| Battery lifeⓘ | 384 hlead | 336 h |
| GPS | true | true |
| Cellular | false | false |
| NFC | true | true |
| OS | Garmin OSlead | HarmonyOS |
Frequently asked
Which has longer battery life, Fenix 8 (47mm) or Watch Ultimate?+
Fenix 8 (47mm) lasts 384 hours vs 336 hours.
Do Fenix 8 (47mm) or Watch Ultimate support ECG?+
Both support ECG.
Which has cellular, Fenix 8 (47mm) or Watch Ultimate?+
Neither offers cellular.