Fossil seems superior (never used it professionally though), but i did use mercurial, and in practice it's really inferior imho. It isn't much simpler, as my git aliases are with me since 2014, and that make git as simple to use (for me) as mercurial in cli. If i need to work with VSCode, both plugin are as "easy" to learn anyway. Magit is just more efficient (thus easier) for idiots like me that had too much time at school, but i understand this is a bad argument.

But no reflogs and no rebase makes it harder to use branching locally, and branching in general in mercurial isn't as flexible as it is in git (ok, i get it, it is footgun, but an airsoft footgun imho).