I'd say either camps top CPU will give you the basis of a great Reaper DAW.
Reasosns to go with one over the other would be things like TB for one. If you're tied to TB then I'd go Intel as it's supported, AMD isn't officially supported but it can work as USB 4 is really TB 4 but without the power requirements.
AMD is releasing the new Zen6 CPU next year and apparently still going to use the AM5 socket so that's something to think about as an upgrade will be a BIOS flash and CPu swap next year.
Reaper threads really well on Windows and on my 9950x machine runs very nicely indeed. I use Cubase as my main DAW though.
just my 2 cents.
M