Apple Watch Ultra vs Apple Watch Ultra 4: should you upgrade?

If you're buying new, get the Apple Watch Ultra 4. The Apple Watch Ultra is no longer sold by Apple.

Brand new, with the longest battery life of any Apple Watch.

The Apple Watch Ultra 4 is 4 years newer, so it will get software updates for longer and holds its value better. If your Apple Watch Ultra still works well, there's no rush, but don't buy one new.