Xubuntu LTS. I’ve been meaning to switch to Debian Stable when something breaks, but it’s my third LTS on the desktop and 5th on the laptop and there was just no opportunity. I also learned to avoid PPAs and other 3rd party repos, and just use appimages when possible.
You can have a kernel from Testing or even Sid, I believe, but yeah, it’s what we want to avoid - tweaking.
LTS is released every 2 years, for reference.
XFCE, using it for over 10 years, not planning to change it unless the DE changes radically.