I switched from Magit to jujutsu. The only difference for me is that stacking PRs has become simpler. It's also made me more conscious of making smaller changes and shrinking what I consider "worth shipping".

Overall a positive experience, but if Magit is working for you, there's no killer feature that makes it worthwhile.

I'm also using https://github.com/bolivier/jj-mode.el which lets me do enough of what I need with jj from within Emacs.