When rebasing a big branch in git with conflicts, you usually end up having to manually resolve conflicts in multiple commits in a row - in jj you just have to resolve the conflict in the first conflicted change, and it usually adapts subsequent changes automatically.
Overall, rebasing branches with conflicts used to be a chore for me with git, and is now mostly a nothing-burger. Of course, I don't know the exact details of your scenario, so I'm not sure if it'd help, but I'd say it's worth trying, esp. if it's a common pain-point for you.