Speaking only of the Air here: The newer laptop feels thicker, since it doesn't have the nice tapered front. In general use, outside of only one external display in clamshell mode, the M1 feels similar. If you push things, like for video editing or rendering, the M2 or M3 are markedly better.
However, you quickly hit throttling if you push for more than a couple minutes at a time (like when you export in Handbrake, it will slow down and only run marginally faster than the M1, in my experience).
This is a cool idea, although presumably m3 would be faster even for single thread apps? Also, are there cases where memory bandwidth could leave cpu at less than 100% on m1 but still be faster on m3?
However, you quickly hit throttling if you push for more than a couple minutes at a time (like when you export in Handbrake, it will slow down and only run marginally faster than the M1, in my experience).