CPU brand (as in AMD/Intel) makes little if any difference in linux, stark contrast to Nvidia/AMD GPU. There was a period of time where some of the intel CPU "efficiency cores" were not properly scheduled in the kernel but I think that's a lot better now as long as you use a relatively new kernel. There are different power/frequency management flags you can pass to the boot params based on intel/amd but that probably makes more of a difference if you're on battery: https://wiki.archlinux.org/title/Ryzen

I think there used to be some limitation in using resizeable BAR with an intel CPU and AMD GPU, but that hasn't been an issue for a while.

I have a 5950x with a 6900xt in my linux box and have had no complaints.

My experience with my Ryzen 7900x has been no problems. The motherboard (ASRock PG Riptide B650E) had some issues on first boot that just required a BIOS update to fix. But I've had no problems dualbooting Windows and MX Linux on my system. With the caveat that you must use a cutting-edge distro with a 6.x kernel or better for proper hardware support on latest gen stuff.

CPU's are pretty agnostic this gen. Both Intel and AMD have comparable performance. AMD a little better in games, Intel a little better in productivity- but only by a few percent. AMD wins in power efficiency by quite a bit too, with the downside of requiring a DDR5 early-adopter tax for AM5 making the buy in a little more expensive. So it's really a wash no matter who you choose.

The 7900 is significantly better than the 13600 in multi-core performance. In single-core performance they're fairly comparable. If you only care about single-core, you can also consider dropping down to the Ryzen 7700, which is basically the same but with fewer cores.

Luckily, pretty much any modern x86 CPU works about as well as any other. I've had a Ryzen CPU for about three years and an Intel CPU before that, and I notice no differences (apart from obviously the faster CPU being faster).

There's not any significant difference when it comes to Linux compatibility, I've had entirely fine experiences with both.

I would go Intel until AMD fixes their fTPM. https://www.phoronix.com/news/Linux-6.3-Fix-For-AMD-fTPM

Amd and Intel Just compare them, i will chose amd with closed eyes