I recommend OpenSUSE Tumbleweed since it's a sane and tested rolling release without the blood, so you get the latest KDE updates with the latest kernel and pac

I recommend OpenSUSE Tumbleweed since it's a sane and tested rolling release without the blood, so you get the latest KDE updates with the latest kernel and packages. I wouldn't recommend Kubuntu or KDE Neon, as the latest KDE releases are developed on the latest kernel, so, using it on Ubuntu based distros with old kernel and old packages might not be the best experience for the latest KDE releases or even cause issues. Anecdotally, KDE also runs better on Tumbleweed than on Fedora for me. Also, maybe give Gecko Linux a try, it's a sane, noob friendly, batteries included version of Tumbleweed, with Nvidia drivers and proprietary codecs out of the box, along with a default to X11 because the author doesn't consider Wayland ready for prime time. Just make sure to do a sudo zypper dup after installation to update the OS and packages since the packages on the ISOs are out of date as the ISOs are updated about twice a year, which is not ideal for a rolling distro but to be fair, the whole Gecko "operation" is run for free by one guy so this is understandable.