As someone who has used X11 and Wayland, it doesn't matter for the typical user. If you, like me, have a penchant for some smaller desktop environments like XFCE or window managers, you will be stuck with X11, but many are already working on porting to Wayland.

Couple edge cases for gaming, namely screen tearing on some X11 configurations and certain Nvidia hardware running into issues on Wayland. For multi-monitor or high DPI users, Wayland handles per-monitor DPI and fractional scaling far better than X11. Maybe a couple more edge use cases for remoting into the desktop, but Wayland support is also improving quickly on that end. In any case, Wayland is by design more secure than X11.