I’ve been very happy with my Manjaro install on AMD GPU, everything worked out of the box on fist try install without any weird step. I would say you could jump straight to Arch/Arch-based, but first research about your GPU compatibility.
(I’m aware of how Manjaro is perceived and its downsides, please avoid comments suggesting me to switch).
Yes, but both Intel and AMD offer an equivalent (not as mature, though). AMD is FSR and Intel is XeSS