Mariguana

I am an incoming Evolution and Ecology PhD student starting in Fall 2019. I received an offer from UC Riverside two weeks ago and accepted it this last weekend. I was pretty satisfied and comfortable with my choice when out of the blue, the University of Arizona offered me admission two days ago. I know I can still retract my acceptance to Riverside but the idea of having to write that email makes me uncomfy. I'm also not sure which school I prefer and would have picked if the acceptances came in at the same time. I like the research I would do at Riverside more and the location is better for me and my boyfriend, but I got the sense interviewing there that there's some drama in their EEB department and a bit of friction between the professors and grad students. The U of A is undeniably a better program and a better organized department, and I connected with the grad students there more over the interview weekend, but I'm less excited about the research (although it would probably advance my career more) and I'm not crazy about the idea of returning to my hometown. Both are great programs and I'd be happy either way, but I have to make a choice by Monday and I don't know what to do. Any advice would be welcome!