He's an excellent manager. His teams are attacking and tactically flexible. but he's not ready for United or a massive club like that just yet IMO. His coaching style involves a lot of risk but not a lot of control. I think he will be expected to replicate a dominant style of football at a top club but against top quality counter attacking teams, his teams will get exposed.
he needs a few more years experience of coaching Leipzig before he should move to a massive club.
PS - if we need anyone from Leipzig at United, its Nkunku and /or Werner.