Between the Watch Ultra 3 and vívoactive 5, the Watch Ultra 3 comes out ahead in peak brightness and display size, while the vívoactive 5 wins on battery life and weight. Overall, the Watch Ultra 3 scores 65.3 and the vívoactive 5 scores 53.3 on our Mars Score.
Which should you buy?
The Watch Ultra 3 is the clear pick on raw spec strength, leading by 12.0 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 Watch Ultra 3 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 peak brightness, display size, water resistance, among others.
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.
Both ship with comparable spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the Watch Ultra 3 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Apple - Watch Ultra 3 wins
- ▲Peak brightness — 200.00% more. 3000 nits vs 1000 nits.
- ▲Display size — 70.00% more. 2.04 " vs 1.2 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
- ▲Has ECG.
- ▲Has Cellular.
Why Garmin - vívoactive 5 wins
- ▲Battery life — 266.67% more. 264 h vs 72 h.
- ▲Weight — 36.00 g less. 26 vs 62.
Spec comparison
Design
| Spec | Apple - Watch Ultra 3 | Garmin - vívoactive 5 |
|---|---|---|
| Case size | 49 mmlead | 42 mm |
| Weight | 62 g | 26 glead |
| Case material | titanium | polymer |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Apple - Watch Ultra 3 | Garmin - vívoactive 5 |
|---|---|---|
| Display size | 2.04 "lead | 1.2 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 3000 nitslead | 1000 nits |
Health & Fitness
| Spec | Apple - Watch Ultra 3 | Garmin - vívoactive 5 |
|---|---|---|
| ECG | truelead | false |
| SpO2 | true | true |
| Temperature sensor | truelead | false |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch Ultra 3 | Garmin - vívoactive 5 |
|---|---|---|
| Battery life | 72 h | 264 hlead |
| GPS | true | true |
| Cellular | truelead | false |
| NFC | true | true |
| OS | watchOS | Garmin OSlead |
Frequently asked
Which has longer battery life, Watch Ultra 3 or vívoactive 5?+
vívoactive 5 lasts 264h vs 72h.
Do Watch Ultra 3 or vívoactive 5 support ECG?+
Watch Ultra 3 supports ECG; vívoactive 5 does not.
Which has cellular, Watch Ultra 3 or vívoactive 5?+
Watch Ultra 3 offers a cellular variant; vívoactive 5 is Wi-Fi only.
Spec-level deep dives
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