Garmin - Fenix 8 (47mm) vs Google - Pixel Watch 3 (45mm)

These two are nearly even on the Mars Score (71.9 vs 69.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.

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, water resistance. The single most decisive one: Battery life — 966.67% more. 384 h vs 36 h.

Pick the Pixel Watch 3 (45mm) 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, cellular. The single most decisive one: Peak brightness — 100.00% more. 2000 nits vs 1000 nits.

Both ship with comparable ecg, display size, spo2, 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.