Linux

Unless you are on NVidia or need X11 specific things (E.g. a lot of the accessability stuff) I would go for Wayland, it still has some issues but so dose X11 and Wayland is simply the new display server from the xorg foundation because X11 was impossible to properly update by now, it has far too much lagacy code and didn't get any new version in ages for that reason.

X11 because Discord is unusable for me on Wayland, and I use it every day.

Edit: I recently switched to a 7800 XT (was using a 3080), and the discord problem was either solved since the last time I tried it, or not being on nvidia helps - no more weird input lag etc. in discord, so I've moved over to Wayland finally.

Both of them have issues depending on the setup. X11 has worked flawlessly in my experience. Wayland has worked the same for most.

Personally, Wayland still has some growing pains, especially in regards to Input handling (mouse, keyboard, etc). In X11 it was "trivial" to edit one file and have the settings stick across different WMs (switching from DWM to i3, etc.) There's no standard for this with Wayland since it's up to the compositor to handle these things, meaning you're relearning how to do something as basic as setting pointer speed each time you try a new compositor. This is my only real fair gripe about it currently, as the rest of my complaints are just due to how young a lot of the Wayland-specific tools are - this will improve with time.

Either way is fine usually. If you really care about 1:1 trackpad gestures like I do, get Wayland. If you have an nvidia card, get x11. Otherwise it’s probably not something most people will even notice.

x11 cuz xfce also .. i want a just working system^^

I still use X11 because one of my necessary voip apps (mumble) doesn't yet support wayland's method of global hotkeys.

Otherwise I don't particularly care one way or the other.

X11 because KDE cut some features for Wayland (some that will be cut in Plasma 6 X11 too, yay) and some apps just don't support wayland for technical reasons.

X11 for xdotool. ydotool doesn't support (& can't really support with it's current architecture) retrieving information like the current mouse location, current window, window dimensions & titles. Also, normal (unprivileged) user ydotool use requires udev rules or session scripts and/or running a ydotool daemon & many distros don't yet ship with this Just Working.

X11 for Alt-F2 r to restart Gnome Shell without ending the whole session. This is a useful workaround for a variety of Gnome bugs.

X11 because my current setup on Wayland crashes constantly, otherwise always Wayland.

Wayland, works better with games. Unless it's star citizen, then x11 because it somehow breaks the elevators

Wayland. It's super smooth and supports new display features.

Everything works, but I don't really use global keyboard shortcuts.

X11 because i3wm

Currently on Wayland with AMD. Only issue is I cannot Steam remote play without relogging into X11, but that is a very infrequent occasion.

Everything else (mostly gaming) works very well for me.

I use xpra which lets me run persistent seamless windows from my VMs and remote servers. It would probably work okay with xwayland but i might as well keep using X. I understand why people use Wayland though and would recommend it to newcomers.