Pick one that fits your bills! Usually, AMD ones have more VRAM for the same price compared to Nvidia... I use Nvidia here (Asus tuf rtx3080 with 12GB VRAM), but I'd use an AMD one without problems too, if I had one...

Just avoid Intel Arc right now!!!

PS: if you need CUDA, you'll have to use Nvidia

No idea about AMD but I have nvidia 3070 and works just fine. I use gnome for gaming and kde works well too. No settings changed, simple archinstall script with nvidia proprietary drivers and steam.

I'm not sure why but xfce multi screen gaming is problematic, haven't dived into it.

Not saying don't get AMD but nvidia has horrible reputation which is kinda unfair nowadays. Their driver has improved a lot.

I have an NVIDIA 1060 and it is such a pain in the ass to deal with. The number of random problems I've had with it has put me off from ever buying a computer with NVIDIA hardware ever again. Save yourself the constant walking on eggshells and get AMD.

I have used an GTX 3070 with no issues for the past 3.5 years, before that I used an AMD Vega 64 with no issues. I think if I were buying a new card and could stomach the prices I'd lean towards a Radeon 7900 XTX.

Anything by amd or intel

I have a 2070 super that I use for gaming and tensor stuff. So far no problems with Arch, X11, and i3. I don't really have brand loyalty though, when I last bought a graphics card I just considered what was going to be best for my price point.

AMD is marginally easier but Nvidia is a lot better than people make out. The drivers install with one command in most distros.

I'm using Intel Xe embedded graphics and they are suprisingly good. This is probably the first embedded intel chip that can run games. It's basically on par with low-end Nvidia and AMD cards.