obviously he's in a good spot either way.  ross is a top 3 undergrad business school.  if your son was pursuing economics, UofC would probably be the right choice.  from a practical perspective, the top banks, consulting firms, etc all recruit michigan -- probably even more of a focus than UofC just given the respective size of the schools.  the huge michigan network is certainly a plus later in business.  with that said, he won't have trouble opening doors with a degree from UofC.  so i think you can argue either option, probably just pick wherever he fits better...they are quite different schools.