In theory it does depend on what school you select. The best candidates are picked at each location so, in theory, candidate 25 (who did not make the cut) at CTC may have made it at OAA IF the group was less competitive. Trust me, I have this on good authority. It also ensures that candidates who are successful do no get sent somewhere where they do not want to go.
I would just pick where you really want to go (probably makes articulating it easier in an interview also).