The biggest difference between the campuses is learning pathways. Erie has all of them where Seton Hill and Elmira only have PBL. Elmira is going to brand new in 2020 so the upcoming class will be their first one there. The campus that is”best” is dependent on how you learn what you think you’ll need to be successful.
As far as ranking them for the secondary, assuming the process is the same this cycle as it was this past one, your rankings may play a part in where you would interview but by no means does that impact where you would be accepted. You rank all three campuses at your interview day. If they accept you, they put you into your highest ranked campus and pathway that has an open seat.