Just upgraded 12th gen i7 to 7840U and can confirm that Ryzen handles much better under load. Compiling a rather big Angular project keeps i7 at 100° and 65° afterwards, while Ryzen goes up to 79° only and then drops to 50°. Also initial compilation time is lower on Ryzen with 12 seconds vs 14.5.

Any rolling distro should be fine. I’m using Tumbleweed and kernel 6.6.2 and just upgraded from Intel to Ryzen mainboard and everything just works™.