Between the Vantage V3 and ScanWatch 2, the Vantage V3 comes out ahead in display size and weight, while the ScanWatch 2 wins on battery life. Overall, the Vantage V3 scores 53.5 and the ScanWatch 2 scores 72.6 on our Mars Score.
Which should you buy?
The ScanWatch 2 is the clear pick on raw spec strength, leading by 19.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Vantage V3 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, weight, peak brightness.
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.
Both ship with comparable ecg, cellular, spo2, so those specs don't 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.
Why Polar - Vantage V3 wins
- ▲Display size — 120.63% more. 1.39 " vs 0.63 ".
- ▲Weight — 2.00 g less. 57 vs 59.
- ▲Peak brightness: 1000 nits vs 0 nits.
Why Withings - ScanWatch 2 wins
- ▲Battery life — 328.57% more. 720 h vs 168 h.
Spec comparison
Design
| Spec | Polar - Vantage V3 | Withings - ScanWatch 2 |
|---|---|---|
| Case size | 47 mmlead | 42 mm |
| Weight | 57 glead | 59 g |
| Case material | aluminum | stainless steel |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Polar - Vantage V3 | Withings - ScanWatch 2 |
|---|---|---|
| Display size | 1.39 "lead | 0.63 " |
| Always-on display | truelead | false |
| Peak brightnessⓘ | 1000 nitslead | 0 nits |
Health & Fitness
| Spec | Polar - Vantage V3 | Withings - ScanWatch 2 |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Polar - Vantage V3 | Withings - ScanWatch 2 |
|---|---|---|
| Battery life | 168 h | 720 hlead |
| GPS | truelead | false |
| Cellular | false | false |
| NFC | false | false |
| OS | Polar OS | Withings OSlead |
Frequently asked
Which has longer battery life, Vantage V3 or ScanWatch 2?+
ScanWatch 2 lasts 720h vs 168h.
Do Vantage V3 or ScanWatch 2 support ECG?+
Both support ECG.
Which has cellular, Vantage V3 or ScanWatch 2?+
Neither offers cellular.
Spec-level deep dives
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