The towns are relatively similar. Rockford is slightly bigger, slightly bigger, and parts of it are more dangerous than Peoria. Both are their own little urban centers, but are surrounded mostly be corn. Rockford is about an hour closer to the city of Chicago and its airports. Peoria is home of Bradley University, so there is some presence of higher education there, which is absent in Rockford. Rockford is not home of many (or any??) residency programs, so your rotations will be just you and the attending. Idk if that's good or bad, though. Ultimately, the two are similar in many ways. I preffed Peoria simply because they have a rock climbing gym, which is something I care about.