I'm using AMD and I don't remember having any issues. I'm using GNOME with Wayland and it works perfectly fine (I also have 2 monitors with different refresh rates btw). I also have sunshine set up as well and the latency is unnoticable. Last time I tried (a week or so ago) it suddenly stopped working tho because all encoders are failing. Before that it was using vaapi and worked just fine.
Edit: I just tested it and vaapi is working with mpv, so it's probably an issue with sunshine