Amazfit - T-Rex 3 vs Samsung - Galaxy Watch 6 Classic
Between the T-Rex 3 and Galaxy Watch 6 Classic, the T-Rex 3 comes out ahead in battery life and water resistance, while the Galaxy Watch 6 Classic wins on weight and ecg. Overall, the T-Rex 3 scores 79.7 and the Galaxy Watch 6 Classic scores 48.9 on our Mars Score.
Which should you buy?
The T-Rex 3 is the clear pick on raw spec strength, leading by 30.8 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 T-Rex 3 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery life, water resistance, display size.
Pick the Galaxy Watch 6 Classic if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, ecg, cellular.
Both ship with comparable spo2, peak brightness, so those specs don't separate the two — focus on the differences below.
Bottom line: the T-Rex 3 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Amazfit - T-Rex 3 wins
- ▲Battery life — 1580.00% more. 672 h vs 40 h.
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
- ▲Display size — 2.04% more. 1.5 " vs 1.47 ".
Why Samsung - Galaxy Watch 6 Classic wins
- ▲Weight — 9.00 g less. 59 vs 68.
- ▲Has ECG.
- ▲Has Cellular.
Spec comparison
Design
| Spec | Amazfit - T-Rex 3 | Samsung - Galaxy Watch 6 Classic |
|---|---|---|
| Case size | 48.5 mmlead | 47 mm |
| Weight | 68 g | 59 glead |
| Case material | polymer | stainless steel |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Amazfit - T-Rex 3 | Samsung - Galaxy Watch 6 Classic |
|---|---|---|
| Display size | 1.5 "lead | 1.47 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 2000 nits | 2000 nits |
Health & Fitness
| Spec | Amazfit - T-Rex 3 | Samsung - Galaxy Watch 6 Classic |
|---|---|---|
| ECG | false | truelead |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | truelead |
Battery & Connectivity
| Spec | Amazfit - T-Rex 3 | Samsung - Galaxy Watch 6 Classic |
|---|---|---|
| Battery life | 672 hlead | 40 h |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | false | truelead |
| OS | Zepp OSlead | WearOS |
Frequently asked
Which has longer battery life, T-Rex 3 or Galaxy Watch 6 Classic?+
T-Rex 3 lasts 672h vs 40h.
Do T-Rex 3 or Galaxy Watch 6 Classic support ECG?+
Galaxy Watch 6 Classic supports ECG; T-Rex 3 does not.
Which has cellular, T-Rex 3 or Galaxy Watch 6 Classic?+
Galaxy Watch 6 Classic offers a cellular variant; T-Rex 3 is Wi-Fi only.
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.