I recommend you first to not use the distros that are just declinaison of Ubuntu with an other DE and KDE Neon is not worthing the time too. Personnaly I recommend you choosing a more “advanced” distro, KDE can be install on pretty much any distro, so try new things. I don’t know where you are in your Linux journey but you need to test what fits you the most to find something perfect. So if you need something not really hard and can be installed with KDE, I recommend you Debian, kind of the best for your use case, BUT YOU NEED TO TEST.

EDIT : When using Debian you’re not going to get the most recent packages, but it’s a very good distro for the other things.