Are you a solid applicant? If so, rotate where you think you want to do residency. If not, and you have some deficits in your application, then you might want to be a little more strategic. Just because a program has 12 slots and you rotate there doesn't mean they're necessarily going to interview you or that you're the caliber of applicant that they're looking for. Be realistic- it will go a long way in this process.
