Have you used Jujutsu before? It's git-backed and it sounds like it incorporates a lot of these niceties from Mercurial. I find it an awful lot more intuitive than Git to use and the stable identifiers are absolutely lovely to have.
I've never had much contact with Mercurial myself, so are there any features from Mercurial that JJ doesn't already incorporate? Or any differences you find interesting?
