Comment by stavros
Jujutsu is much better than git, and I've switched to it completely, but I do still use lazygit for one thing: It has better diff viewing, it separates the diffs by file and they look nicer. It's the only thing keeping me on lazygit, as jjui is much better otherwise.
Git doesn't fundamentally work with diffs (patches). It stores the complete file and generates a diff.
So you can use any diff tool you like with git, and I presume also with JJ. Look for the setting.
Edit: in git it's the diff.external setting