At this point it's very easy: no CarPlay, no buy. So no Tesla (obv), no Rivian.

Opinionated, but Tesla's interface seems better than any CarPlay?

The thing with CarPlay that I hate the most is that it is laggy. I have it on a Series 5 BMW and Spotify has a delay of at least 4s when you select a song and when it actually starts playing. Same thing when you rapidly skip tracks - the interface changes but the speakers (or any other non-CarPlay interface) can't really keep up. It really is a joke, especially on that kind of vehicle.