I will say Michigan grad schools are fond of USC undergrads because of location. And because of sheer size, Michigan is more competitive than USC and other privates, including Stanford, at the undergraduate level, so your chances of doing well at USC and getting into Ross (or Wharton) aren’t that bad. That said, you will know the first semester whether Michigan is a good fit so try it out, it’s worth a shot because you have nothing invested at either school at this point. You can always return and transfer into USC, which would take you based upon your change of heart. I had a high school acquaintance who actually transferred from Stanford to USC for similar reasons. Go and you will have no regrets.