I have used KDE through Kubuntu and Arch for some time after trying virtually every DE/WM out there. It's not perfect, but it's really good. I don't know how people use the stock Ubuntu DE. It's tragic.
Another Ubuntu based distro with KDE, and one that I think most people haven’t heard about, but which I am personally fond of is KDE’s own KDE Neon.
> More than ever people expect a stable desktop with cutting-edge features, all in a package which is easy to use and ready to make their own.
> KDE neon is the intersection of these needs using a stable Ubuntu long-term release as its core, packaging the hottest software fresh from the KDE Community ovens.
I've found KDE Neon to be WAY more stable than Kubuntu. And this has been the case on multiple LTS versions. I just think this is odd since, in theory, they should only differ by the KDE apps that are installed.
I wish KDENeon was around when I was kde-crazy, back in 3.x/4.x times. Finding a distro that was both reliable and able to run nightly builds of KDE apps was really really difficult. Despite all efforts of some outstanding maintainers, Kubuntu always felt like a hack, with unavoidable GNOME stuff popping out all over the place.
I've tried Neon in virtualbox and it looks nice and consistent. Performance wasn't great but that's more or less a given under VirtualBox. I might give it a go on my next laptop.
I'm using Ubuntu+gnome in the hope integration issues have been worked out faster compared to Ubuntu with an alternate DE that just isn't exposed as much, and that'll give me just trouble and less info on askubuntu.com etc. But since gnome doesn't cut it for me, I'm going to switch distros alltogether anyway. OpenSuse or something else having KDE as preferred DE? Don't know yet; would be cool to have a mainstream systemd-less distro with KDE.
> More than ever people expect a stable desktop with cutting-edge features, all in a package which is easy to use and ready to make their own.
> KDE neon is the intersection of these needs using a stable Ubuntu long-term release as its core, packaging the hottest software fresh from the KDE Community ovens.
https://neon.kde.org/
I run this on my desktop.