Garmin - Fenix 8 (47mm) vs Samsung - Galaxy Watch Ultra 2

The Fenix 8 (47mm) edges ahead on the Mars Score (71.9 vs 67.5), but the 4.4-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the Fenix 8 (47mm) 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. The single most decisive one: Battery life — 540.00% more. 384 h vs 60 h.

Pick the Galaxy Watch Ultra 2 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are peak brightness, weight, display size, among others. The single most decisive one: Peak brightness — 200.00% more. 3000 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.