for what it's worth, I'm not from the midwest, and i interviewed at U of Chicago and Cook County-
Loved U of C- very focused on education/residents as teachers, which is what I'm into- but they had a very open attitude, and I got the sense you'd be supported in whatever you decided to focus on.
Cook County wasn't bad per say, but I got the impression the program is on its way out- smaller and smaller classes of residents each year- rumor (again, take hear-say for what it's worth) has it that bc Il medicaid covers nearly every kid in the state, parents are choosing to take their kids to other hospitals. That said, I liked the PD, I liked the drs I met, felt like it would be a good environment to learn in- but I don't think you'd have the same opportunities you'd have at other programs.