I saw both. Mrs. Doubtfire was a very funny, heartwarming show, and Rob McClure was great. The score was not memorable, but I didn't hate it. It did not affect my enjoyment of the show.
As for MJ, the book was superficial, and Myles Frost gave a very one-note performance delivering dialogue. However, the musical numbers were sensational, especially in Act two. Frost's performance in the second act dance numbers was fantastic and worth the price of admission.