GNOME excels on point-release distros like Debian or Fedora, while KDE is best on rolling releases like with Arch.
GNOME extensions breaking on updates is an issue that can be almost completely avoided if you can choose when you want to update. On a similar note, I find that a lot of new GNOME features need a lot more time in the oven and are full of bugs on release.
KDE is always releasing new bug fixes and even features outside their point releases, and I find the best way to get stability is running a rolling release distro to get everything right away. Because a lot of KDE features are so cutting edge, they come with more severe bugs, and you’re going to want the fixes to those right away.
I prefer GNOME, but I think what desktop you use is going to depend on your preferred distro, or vice versa. Not to say that you can’t run these desktops on different distros, but from experience, this is the best way to avoid problems that come with each.