The big one is proper support for diffrent refresh rate monitors and VRR. Also some security improvment and long term support (X11 probably has only a few years before development stops).
What are the disadvantages?
Its still a little buggy in some cases (especialy when using Nvidia hardware) but with an AMD or Intel GPU its more then usable. Some apps don’t play nice with Xwayland but its pretty rare.
How’s gaming?
I haven’t encontered any major issues with games. Some games might need launch parameters but usualy you can just google it and find the answer very quickly. Performance its exactly the same as on X (maybe even slightly better)
What would be the best way to switch?
On your desktop with KDE you can just select “KDE (Wayland)” in your display manager and KDE should just run like normal but with Wayland. On you laptop you’d need to switch to a diffrent WM since i3 dosen’t support Wayland. Your best bet would probably be Sway since its compatible with i3 configurations.
Why have you made the switch?
I wanted to check out how well Wayland works and found that it works fine for me, and so i decided to move. Also X was giving me issues with screen tearing and multiple monitors.