Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Huawei - Watch Ultimate | Withings - ScanWatch 2 |
|---|---|---|
| Display size | 1.5 " | 0.63 " |
| Battery life | 336 h | 720 h |
| Weight | 76 g | 59 g |
| Water resistance | 10 ATM | 5 ATM |
| Peak brightness | 1000 nits | 0 nits |
Between the Watch Ultimate and ScanWatch 2, the Watch Ultimate comes out ahead in display size / water resistance, while the ScanWatch 2 wins on battery life / weight. Overall, the Watch Ultimate scores 71.5 and the ScanWatch 2 scores 78.3 on our Mars Score.
Which should you buy?
The ScanWatch 2 edges ahead on the Mars Score (71.5 vs 78.3), but the 6.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Watch Ultimate if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are display size, water resistance, peak brightness. The single most decisive one: Display size — 138.10% more. 1.5 " vs 0.63 ".
Pick the ScanWatch 2 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are battery life, weight. The single most decisive one: Battery life — 114.29% more. 720 h vs 336 h.
Both ship with comparable ecg, cellular, spo2, so those specs do not separate the two — focus on the differences below.
Bottom line: the ScanWatch 2 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Huawei - Watch Ultimate or Withings - ScanWatch 2?
Withings - ScanWatch 2 leads the current Mars Score by 6.8 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 Huawei - Watch Ultimate if…
Huawei - Watch Ultimate has the measurable edge on display size in, water resistance atm, peak brightness nits.
Choose Withings - ScanWatch 2 if…
Withings - ScanWatch 2 has the measurable edge on battery life h, weight g.
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 Huawei - Watch Ultimate wins
- ▲Display size — 138.10% more. 1.5 " vs 0.63 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
- ▲Peak brightness: 1000 nits vs 0 nits.
Why Withings - ScanWatch 2 wins
- ▲Battery life — 114.29% more. 720 h vs 336 h.
- ▲Weight — 17.00 g less. 59 vs 76.
Spec comparison
Design
| Spec | Huawei - Watch Ultimate | Withings - ScanWatch 2 |
|---|---|---|
| Case size | 48.5 mmlead | 42 mm |
| Weight | 76 g | 59 glead |
| Case material | titanium | stainless steel |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Huawei - Watch Ultimate | Withings - ScanWatch 2 |
|---|---|---|
| Display size | 1.5 "lead | 0.63 " |
| Always-on display | truelead | false |
| Peak brightnessⓘ | 1000 nitslead | 0 nits |
Health & Fitness
| Spec | Huawei - Watch Ultimate | Withings - ScanWatch 2 |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Huawei - Watch Ultimate | Withings - ScanWatch 2 |
|---|---|---|
| Battery lifeⓘ | 336 h | 720 hlead |
| GPS | truelead | false |
| Cellular | false | false |
| NFC | truelead | false |
| OS | HarmonyOS | Withings OSlead |
Frequently asked
Which has longer battery life, Watch Ultimate or ScanWatch 2?+
ScanWatch 2 lasts 720 hours vs 336 hours.
Do Watch Ultimate or ScanWatch 2 support ECG?+
Both support ECG.
Which has cellular, Watch Ultimate or ScanWatch 2?+
Neither offers cellular.