Stable for me, want my OS to be boring and unsurprising. I also don’t have any brand new hardware, that could be a consideration on which version (or which distro) to use.

Testing becomes the next stable so it’s not a huge jump in the grand scheme of things but I don’t personally have that much time to figure out new OS issues. But maybe I’d install testing or unstable on a spare machine that isn’t my main day-to-day system.