Apple M2 vs. AMD Ryzen 7 PRO 6850U Performance In Nearly 200 Benchmarks

As for AMD Rembrandt vs. Apple M2, it largely comes down to the particular workloads of interest to you for how viable the Apple M2 on Linux is against AMD's x86_64 competition. If the software of interest has been optimized at all for AArch64 is one of the big factors.

At least with Linux running on the Apple Silicon hardware it opens up more developers to relatively affordable AArch64 hardware with good performance and will likely lead to more well optimized AArch64 open-source software moving forward and lifting the ecosystem thanks to the robust availability.

Of course, all these benchmarks today are also only focused on the CPU performance... Apple M1 and M2 currently lack any accelerated graphics support under Linux. It will still be months at least before seeing any viable OpenGL driver and likely longer before any Vulkan driver support. So for now you need to be content with software-only acceleration on Apple Silicon Macs under Linux.