1. Research fit
2. Research fit, like 4-5 faculty, I'd love to work with plus an additional 4 or 5 doing research in a similar area that would complement what I want to do extremely well
3. They really want me to come to their program, or at least it appears that way
4. Seriously the fit is amazing. It's not the "best" or most "prestigious" school I've gotten in to, but y'know I'll be happier doing research there, if I decided to go -- which it's looking like I will -- and I think the quality of the work I'll be doing will be great and I can do more and go just as far if not farther and have the most fun at this school than any of the others I got in to.
5. ALL the students I met were SUPER happy and relaxed and not stressed. Goodbye East Coast!
6. Didn't factor into my decision making, but it's also my favorite of all the cities I visited.