I'm obviously biased, but I even if I wasn't, I'd come to the same conclusion. Having a course from people who only do MCAT prep and having the authors of highly respected books as teachers for most of the classes makes it kind of a no brainer. Just make sure the owners are teaching the classes, which they pretty much always do.
It also depends on where you're located and who you'll get as your teachers. For me, I really liked Princeton Review, and all my teachers were insanely smart, scoring 36+. The guy who taught orgo scored 15 on BS, so it was obvious he knows what he's talking about, and all of them have taught these courses before. Contact your local office for Kaplan and TPR and see what kinds of instructors they have.
Another reason I liked TPR was their diagnostic tests and online practices. I think their practice material is most similar to the real MCAT.
I live in Vancouver, BC but I am planning on being in the LA area for the summer. This is why I have decided to consider The Berkeley Review in my program choice. I've already come to the conclusion that I am not going with Kaplan due to mixed reviews amongst all my friends. So its TBR vs. TPR. I've heard nothing but good things from TBR. I don't know much about TPR though.