It's not just about coaching... It's very hard to say one coach is significantly better than another but of course we've seen more of Motzko and his lack of adjustments sometimes. But he obviously can coach as his teams with few superstars have put themselves in good pairwise positions.
It's about getting ready for the future (Motzko is old, Barr is young) with someone that understands the current landscape of recruiting, has lots of connections, from MN, and is a guy that could be with the program for 20+ years.