Which is better for running and hiking?

The Ultra 3. It adds dual-frequency GPS, heart rate zones, running power, a compass and Backtrack, plus 42-hour battery for long days. The SE 3 handles basic workouts fine but has standard GPS and 18-hour battery.

Is the Ultra 3 worth the extra $350?

Only if you use cellular, dive, or go on multi-day trips. For daily wear, sleep tracking and gym workouts, the SE 3 covers the same core features for far less.

Which lasts longer on a charge?

The Ultra 3, by a wide margin: up to 42 hours normally and 72 in Low Power Mode versus 18 hours on the SE 3.

Can I swim with either one?

Yes. The SE 3 is water resistant to 50m for pool and open-water swimming. The Ultra 3 goes to 100m and adds a depth gauge and water temperature sensor for diving.

Does the SE 3 have cellular?

Not this listing. It is the GPS-only model, so it needs your iPhone nearby for calls and data. The Ultra 3 has cellular built in.

Which fits a smaller wrist?

The SE 3. Its 40mm aluminum case is much smaller and lighter than the Ultra 3's 49mm titanium case.

Apple Watch SE 3 (GPS, 40mm) vs Apple Watch Ultra 3

Buy the Apple Watch SE 3 for everyday health, sleep and fitness tracking at about a third of the price. Buy the Ultra 3 if you dive, run ultras, or want cellular and multi-day battery in a titanium case. As of November 7, 2026, the SE 3 is $198.99 at eBay and the Ultra 3 is $549.00 at Best Buy, a gap of about $350.

Today the Apple Watch SE 3 (GPS, 40mm) costs $350.01 less at its best price.

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