Between the Watch SE 3 and vívoactive 5, the Watch SE 3 comes out ahead in display size / cellular, while the vívoactive 5 wins on battery life / weight. Overall, the Watch SE 3 scores 56.1 and the vívoactive 5 scores 53.3 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (56.1 vs 53.3). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Watch SE 3 if you care most about display size / cellular. The biggest gaps in its favor are display size, cellular.
Pick the vívoactive 5 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, spo2.
Both ship with comparable ecg, water resistance, peak brightness, 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.
Why Apple - Watch SE 3 wins
- ▲Display size — 48.33% more. 1.78 " vs 1.2 ".
- ▲Has Cellular.
Why Garmin - vívoactive 5 wins
- ▲Battery life — 1366.67% more. 264 h vs 18 h.
- ▲Weight — 7.00 g less. 26 vs 33.
- ▲Has SpO2.
Spec comparison
Design
| Spec | Apple - Watch SE 3 | Garmin - vívoactive 5 |
|---|---|---|
| Case size | 44 mmlead | 42 mm |
| Weight | 33 g | 26 glead |
| Case material | aluminum | polymer |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Apple - Watch SE 3 | Garmin - vívoactive 5 |
|---|---|---|
| Display size | 1.78 "lead | 1.2 " |
| Always-on display | false | truelead |
| Peak brightnessⓘ | 1000 nits | 1000 nits |
Health & Fitness
| Spec | Apple - Watch SE 3 | Garmin - vívoactive 5 |
|---|---|---|
| ECG | false | false |
| SpO2 | false | truelead |
| Temperature sensor | false | false |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch SE 3 | Garmin - vívoactive 5 |
|---|---|---|
| Battery life | 18 h | 264 hlead |
| GPS | true | true |
| Cellular | truelead | false |
| NFC | true | true |
| OS | watchOS | Garmin OSlead |
Frequently asked
Which has longer battery life, Watch SE 3 or vívoactive 5?+
vívoactive 5 lasts 264 hours vs 18 hours.
Do Watch SE 3 or vívoactive 5 support ECG?+
Neither supports ECG.
Which has cellular, Watch SE 3 or vívoactive 5?+
Watch SE 3 offers a cellular variant; vívoactive 5 is Wi-Fi only.
Spec-level deep dives
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