I use the Gentoo docs as my guide for this - both have first class support and they don't nudge you in either direction.

Out of curiosity: Is there any app that works on Wayland but not on X?

That's a new take: Project with new release 1 day ago declared deprecated!

I've been using Linux for around 2 decades. I am currently running Fedora 43/KDE Plasma ... and wait for it ... Xorg.

Why? Because it works. It works well!

Why don't I use Wayland? Because it breaks everything.

  - Screensharing is just wonky and inconsistent across applications. It has gotten better in the last 2 years, but it's still quite wonky. And janky. And flobby. I **could** put effort into fixing this, but it already works in Xorg. 
  - I have a bunch of Xorg/xdotool scripts bound to hotkeys. Move, resize windows. If AppX is running and the window isn't shown, show it; otherwise, hide it. If AppX and AppY are both running and meta+y is pressed, then tile in a specific way, else do something different. These scripts are either ungodly difficult to rewrite to work in Wayland or just flat-out impossible in the name of "security".
  - Easystroke. https://github.com/mmh0000/easystroke . Nothing like that exists on Wayland (that actually works). And I can not live without it after having it for 20 years.