Wayland or X11? Why?
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X11. I heard NVIDIA is buggy on Wayland. Also, I've never really had much problems with X11 and my system setup.
I found that Wayland works better in my case: XPS 17 with Nvidia on Ubuntu lts. Less stuttering and overall smoother feeling. The only issue is that the screen doesn't always turns on after suspend, but this is healed with ctrl+f1.