Stable? Debian or Fedora.
For an end-user machine, I've found that rolling release is much better than point release (much newer, less buggy/crashy -- paradoxically -- versions of software and GPU drivers). (Although, surprisingly, Fedora seems to have very fast package updates despite being a point release.) For rolling, Manjaro is my top pick. Arch is a close second, assuming you've mastered the arcane art of its installation.
You might be thinking, "But a fringe, rolling release distribution can't be as stable as Ubuntu, the de facto default point release distro that ostensibly claims 99% of Linux marketshare." You would be insane to not be thinking that. But I guess companies' potential for incompetence is even more insane since that's been the opposite of my experience. I've had less installation issues and crashes during daily use of Manjaro than on Ubuntu over the last few years, which really surprised me. It's like Ubuntu is decaying. Or maybe I just got bad RNG. Or maybe it's that program and DE devs are always working on the latest version of their software while older versions are an afterthought, so rolling distributions that keep you up to date with the latest versions seem stabler. :p