Wayland is just more responsive and smoother than x11 in all cases I've tried short of really old hardware. Nvidia just haven't caught up to Wayland yet and it makes complex things like rendering a vulkan pipeline through an x11 compatibility layer buggy on Nvidia.
I'm hoping the day they finish porting wine to Wayland it'll fix all the issues I'm having with Nvidia. Or the open source driver getting good enough for me to drop the proprietary driver.
My experience XWayland apps can get a little weird on Nvidia for some reason. I've witnessed flickering ui, misplaced drop shadows, and the xorg cursor popping up at the very edge of XWayland windows. On AMD Wayland just works and at least in games AMD shows an improvement while Nvidia shows a decrease in performance.