Apple - Watch Series 11 (45mm) vs Apple - Watch Ultra 3

The Watch Ultra 3 edges ahead on the Mars Score (60.5 vs 65.3), but the 4.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the Watch Series 11 (45mm) if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight.

Pick the Watch Ultra 3 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, display size, water resistance.

Both ship with comparable ecg, cellular, spo2, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.