I was accepted to MSU and cancelled my remaining five interviews because it was my first choice. What is your state of residence?
MSUCOM is pretty amazing but really expensive if you are out of state! They do have the most research funding of the DO schools and a lot of established rotations. Michigan itself is extremely DO friendly as well.
I have heard DMU is pretty solid as well so I really don't think you could go wrong. If I were you I would only go on the interviews you could potentially see yourself attending over DMU.