Amazfit - T-Rex 3 vs Samsung - Galaxy Watch 6 Classic
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Amazfit - T-Rex 3 | Samsung - Galaxy Watch 6 Classic |
|---|---|---|
| Battery life | 672 h | 40 h |
| Weight | 68 g | 59 g |
| Water resistance | 10 ATM | 5 ATM |
| Display size | 1.5 " | 1.47 " |
| ECG | false | true |
| Cellular | false | true |
Between the T-Rex 3 and Galaxy Watch 6 Classic, the T-Rex 3 comes out ahead in battery life / water resistance, while the Galaxy Watch 6 Classic wins on weight / ecg. Overall, the T-Rex 3 scores 62.7 and the Galaxy Watch 6 Classic scores 66.8 on our Mars Score.
Which should you buy?
The Galaxy Watch 6 Classic edges ahead on the Mars Score (62.7 vs 66.8), but the 4.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
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. The single most decisive one: Battery life — 1580.00% more. 672 h vs 40 h.
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. The single most decisive one: Weight — 9.00 g less. 59 vs 68.
Both ship with comparable spo2, 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.
Which should you buy: Amazfit - T-Rex 3 or Samsung - Galaxy Watch 6 Classic?
Samsung - Galaxy Watch 6 Classic leads the current Mars Score by 4.1 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 Amazfit - T-Rex 3 if…
Amazfit - T-Rex 3 has the measurable edge on battery life h, water resistance atm, display size in.
Choose Samsung - Galaxy Watch 6 Classic if…
Samsung - Galaxy Watch 6 Classic has the measurable edge on weight g, has ecg, has cellular.
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 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 672 hours vs 40 hours.
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.