Hi so I was wondering what gpu vendor had the best support intel, amd or nvidia
In the future I wanna upgrade my mid range pc and I dual boot cachyos (arch btw) and windows 11 (to play game that don't work on linux)
They continue to be great on newer GPUs, although the first ~6-12 months might have some small bugs. I have really enjoyed my RX 7800 XT. It's working perfectly now, but I had an issue specific to newer GPUs where every other boot would fail (Arch Linux). It was a known issue and fixed in kernel 6.7.3 (I think) and issues like that seem to be rare.
I got a Radeon 7800XT in March and have had no significant issues with it on Arch Linux. The issues I have had were from running the bleeding-edge mesa-tkg-git drivers which are the pre-release development builds, and sometimes things break there (I had a weird issue where red and green got swapped in X11 apps). You have to go out of your way to run those drivers though, stick with the released version in your distro's repository and you'll be fine. I can play most games above 100Hz at decent resolution and quality. I have a 4K 144Hz monitor with Freesync but for more demanding games usually need to turn down settings a bit or use resolution upscaling like FSR. I upgraded from an Intel Arc A770 and it was a big performance increase.
Nitro is just a marketing term for their high end models, they usually have the Pulse which is the base and the Nitro(+) that has additional features like removable fans.
They cost more but they tend to have a better build quality, but the chip inside is the same.
Sapphire have some pros but I'm not sure Linux is one of them. They release programs for Windows (like controlling LED colors) and do not release an equivalent on Linux (and it's not open source).
I've had good luck with AsRock as well. Before this most recent generation I was Sapphire all the way. But they charge a good premium now that I don't feel is worthwhile if you're in the ~7600xt range or lower.
Sapphire: Meh. They earned a good reputation maybe a decade or two ago, but other brands have been making equally good or even better cards more recently. (Also, my last Sapphire card's fans, including their replacements, were continually developing weird noises and eventually failing.)
I'm happier with PowerColor these days. Currently using a Hellhound RX 7800 XT with great results.