They have a bunch of differences under the hood, particularly when you want to give perms. It makes sense, sort of, on its face, that a user can’t have teams, but why? That decision is pretty arbitrary, to me. Then in GHE, users and orgs have all sorts of fun differences when you consider things like internal/public/private and how people can interact with them; to wit, if you’re in ANY team you can see ANY internal repo in an org, but if you’re limited to just personal repos, you can see no such things.