Hi,
First of all, congratulations for being accepted to three highly successul programs. Try to think that each of them would be a good choice, none of them is bad.
In my opinion, you should also consider what you will study for the next 4-5 years. This is PhD, not an exchange program, so try to figure out an initial belief or expectation about your thesis. My recommendation is that
-categorize your abilities, research interests. consider the future and importance of the subject in the area and select some possible research topics for yourself.
-check faculty member profiles, pick out some possible professors with a good track of record matching with your interests
-print papers of those selected faculty members and read them, choose your favourites.
-do not hesitate, contact with them, talk about possibility of a joint research, their availability, their interests for future research.
And finally, don