On my private machine, I use arch with the newest features.
Work related I am using debian testing on the laptop. The packages are not the newest but I know everything is stable and upades are not in my way. (KDE 6 will arrive there late summer)
KDE neon is a Linux distribution developed by KDE based on Ubuntu long-term support (LTS) releases, bundled with a set of additional software repositories containing the latest versions of the Plasma 6 desktop environment/framework, Qt 6 toolkit and other compatible KDE software.
I would not recommend KDE Neon. Qt applications (like Calibre) sometimes have problems because they're taken from Ubuntu(?) repos but Neon ships their own Qt libs which can cause conflicts.
Mine is that the "fake session restore" hasn't landed yet (it will in 6.1) so the half-dozen konsole and dolphin windows I tend to leave open between reboots don't re-open after rebooting under Wayland.
The reason it's called "fake session restore" is that the Wayland session restore protocol isn't finalized, so as a temporary workaround Plasma on Wayland will re-launch the applications and leave it up to the individual programs to restore their last state.
For some reason when i use Wayland it shows weird artifacts on the bottom of my screen. Doesn't happen on X11 so I'll stick with that until it gets fixed
Not really. I was a heavy critic of the state kde was in because of fractional scalling sucking a lot, but I've been using it on 2 pcs and am now pretty happy. Does everything I need it to.
There's an "Enable HDR" checkbox in the "Displays & Monitor" part of System Settings. Of my two monitors, it only shows up in the configuration of the one that supports HDR (makes sense).