iPhone 15 Pro Max vs iPhone 18 Pro Max: should you upgrade?

If you're buying new, get the iPhone 18 Pro Max. The iPhone 15 Pro Max is no longer sold by Apple.

The newest large iPhone, with the biggest screen in the lineup.

The iPhone 18 Pro Max is 3 years newer, so it will get software updates for longer and holds its value better. If your iPhone 15 Pro Max still works well, there's no rush, but don't buy one new.