First of all, good of you to think of this decision as a blessing and not a problem, many people would love to be in your situation.
I was faced with the same situation as you last winter and I wil give me two cents about that process and how that has worked out in terms of my first quarter.
I was sitting on an acceptance between KCOM and NOVA, two opposites!! what it ended up coming down to for me was
1. I wanted a curriculum that I felt would prepare me for boards, but also for life as a physician. So high board scores, but lots of experience with standardized patients and simulators, which was huge at KCOM.
2. I wanted a place that I like where I could rotate, and KCOM has a huge selection..Nova has mostly Florida, which is cool, but if I didn't like it for some reason, I had no "out" per se.
3. And finally, and now with some perspective, most importantly, I needed a place where I would be happy. This may sound cliche, or goofy, but when I came to KCOM, more than any other place I felt like I would be taken care of...they cared about me, they took interest in me and in a small town you really do feel safe. Additionally, the faculty go out of there way to make sure you understand and learn the material. This is probably generally a trend at most schools, but KCOM exuded this most strongly for me. If you are unhappy where you are, for whatever reasons those may be, location, type of atmosphere of school etc...you will have a very hard time being able to devote yourself to studying as much as you need. You spend a large percentage of your time studying or in class and if this is not a pleasant experience, you will burn out quickly.
Sorry about the ramble, but now that you have decided what is important, try to rationalize through your choices...it took me a long time and a lot of thinking to get here to KCOM, and I was still unsure when i got here, but now two months in I can tell you that finding a place where you will fit and be taken care of is absolutely huge. If you can figure that out and find a place that fits, go there, you will not regret it...best of luck!!!