Sorry I totally meant to include a reply to your dilemma, but it sounds like almost everything is held equal, such as your relationship with the POIs, your research interest at either school. I've gone through a MA already, and I've been screwed over by lack of care and attention from my ex-POI, which ultimately ended in what I call a 'divorce'. If you get a chance, I'd ask the grad students about their experiences, and trust me, if there were any red flags they wouldn't hesitate to tell you. If both supervisors are equally as appealing, then I'd say pick the choice that makes most sense geographically for you, since you mentioned that location is quite key. Hope this is helpful!