The only time I have heard the fans on my pro was when running games on ultra. If you hear the fans chances are if you had the air instead it would be throttling. Up to you if that is tolerable. I can’t stand throttling so I got the macbook pro with two fans.

IIRC they have a fan it just moved air internally and is for all intents and purpose completely silent from the end user's perspective.

I have an M1 Pro that apparently has a fan - I've never seen or heard any evidence that it does actually exist