Between the Vantage V3 and Watch S4, the Vantage V3 comes out ahead in several specs, while the Watch S4 wins on peak brightness and battery life. Overall, the Vantage V3 scores 53.5 and the Watch S4 scores 63.9 on our Mars Score.
Which should you buy?
The Watch S4 is the clear pick on raw spec strength, leading by 10.4 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.
The Vantage V3 doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the Watch S4 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 peak brightness, battery life, weight, among others.
Both ship with comparable ecg, spo2, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Watch S4 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
- No decisive advantages.
Why Xiaomi - Watch S4 wins
- ▲Peak brightness — 120.00% more. 2200 nits vs 1000 nits.
- ▲Battery life — 114.29% more. 360 h vs 168 h.
- ▲Weight — 13.00 g less. 44 vs 57.
- ▲Display size — 2.88% more. 1.43 " vs 1.39 ".
- ▲Has Cellular.
Spec comparison
Design
| Spec | Polar - Vantage V3 | Xiaomi - Watch S4 |
|---|---|---|
| Case size | 47 mm | 47 mm |
| Weight | 57 g | 44 glead |
| Case material | aluminum | stainless steel |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Polar - Vantage V3 | Xiaomi - Watch S4 |
|---|---|---|
| Display size | 1.39 " | 1.43 "lead |
| Always-on display | true | true |
| Peak brightnessⓘ | 1000 nits | 2200 nitslead |
Health & Fitness
| Spec | Polar - Vantage V3 | Xiaomi - Watch S4 |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Polar - Vantage V3 | Xiaomi - Watch S4 |
|---|---|---|
| Battery life | 168 h | 360 hlead |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | false | truelead |
| OS | Polar OSlead | HyperOS |
Frequently asked
Which has longer battery life, Vantage V3 or Watch S4?+
Watch S4 lasts 360h vs 168h.
Do Vantage V3 or Watch S4 support ECG?+
Both support ECG.
Which has cellular, Vantage V3 or Watch S4?+
Watch S4 offers a cellular variant; Vantage V3 is Wi-Fi only.
Spec-level deep dives
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