It's hard to say based on the info you've given. Obviously all these programs are terrific and could be considered "peer" schools. Do you have a geographic preference? What is your current financial situation like (would 20,000 help you a lot currently?).
All things equal I'd take Ross in a heart beat. They seem to be strong in all fields, have a vast and passionate alumni network and I've heard pretty decent things about Ann Arbour (it kills me to say that being that i'm a Wisconsin undergrad student but comfortable that I was in the greatest college town in America-Madison).
Either way, you're in a great situation. Make the decision for yourself as its highly personal and the only way you'll be completely satisfied is if you listen to yourself. You're in good shape, congrats, make a choice and revel in that choice!