Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - Venu 3 | Xiaomi - Watch S4 |
|---|---|---|
| Peak brightness | 1000 nits | 2200 nits |
| Battery life | 336 h | 360 h |
| Weight | 47 g | 44 g |
| Display size | 1.4 " | 1.43 " |
| Cellular | false | true |
Between the Venu 3 and Watch S4, the Venu 3 comes out ahead in several specs, while the Watch S4 wins on peak brightness / battery life. Overall, the Venu 3 scores 74.9 and the Watch S4 scores 76.3 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (74.9 vs 76.3). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
The Venu 3 does not 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. The single most decisive one: Peak brightness — 120.00% more. 2200 nits vs 1000 nits.
Both ship with comparable ecg, spo2, water resistance, 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 - Venu 3 or Xiaomi - Watch S4?
Xiaomi - Watch S4 leads the current Mars Score by 1.4 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 - Venu 3 if…
Garmin - Venu 3 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Xiaomi - Watch S4 if…
Xiaomi - Watch S4 has the measurable edge on peak brightness nits, 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 Garmin - Venu 3 wins
- No decisive advantages.
Why Xiaomi - Watch S4 wins
- ▲Peak brightness — 120.00% more. 2200 nits vs 1000 nits.
- ▲Battery life — 7.14% more. 360 h vs 336 h.
- ▲Weight — 3.00 g less. 44 vs 47.
- ▲Display size — 2.14% more. 1.43 " vs 1.4 ".
- ▲Has Cellular.
Spec comparison
Design
| Spec | Garmin - Venu 3 | Xiaomi - Watch S4 |
|---|---|---|
| Case size | 45 mm | 47 mmlead |
| Weight | 47 g | 44 glead |
| Case material | stainless steel | stainless steel |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Garmin - Venu 3 | Xiaomi - Watch S4 |
|---|---|---|
| Display size | 1.4 " | 1.43 "lead |
| Always-on display | true | true |
| Peak brightnessⓘ | 1000 nits | 2200 nitslead |
Health & Fitness
| Spec | Garmin - Venu 3 | Xiaomi - Watch S4 |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Garmin - Venu 3 | Xiaomi - Watch S4 |
|---|---|---|
| Battery lifeⓘ | 336 h | 360 hlead |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | true | true |
| OS | Garmin OSlead | HyperOS |
Frequently asked
Which has longer battery life, Venu 3 or Watch S4?+
Watch S4 lasts 360 hours vs 336 hours.
Do Venu 3 or Watch S4 support ECG?+
Both support ECG.
Which has cellular, Venu 3 or Watch S4?+
Watch S4 offers a cellular variant; Venu 3 is Wi-Fi only.