For my money, Kelvin Sampson is the best coach in CBB. He also seems to have the energy of a guy 15 years younger. Now someone might come up with a multitude of reasons he wouldn't be a good coach for UK. But, as I said, if the question is just who's the best coach to win games, I think it's Sampson.
Personally, I also like Buzz Williams. But I wonder if the best coach for UK isn't someone we haven't even heard of yet. An up and comer who can really motivate and has some good ideas about how to best handle NIL and the transfer portal.