Opensuse tumbleweed because at least they test software before pushing to users.

Nobara or Bazzite are gaming ready and easy to use.

I think any keyboard with qmk/via support will work just fine.

Once I touched kde, It’s always kde.

nothings stops You from trying. Linux gaming is fantastic nowadays.

commercial, immutable distro with professional support team. Easy desktop env. like cinnamon, budgie or kde Preinstalled on new devices