I voted for research fit, because I feel like that was my shortcoming in applications: I expressed interest in research done in the dept, but didn't have experience to back that specific interest. I think there are 2 problems with programs looking for fit: 1. students don't have a chance to explore new areas in grad school (esp. in my field where you need a pretty much permanent advisor before you get accepted). 2. students can't get into a new area of research that isn't already well established. I think problem 1 is what's keeping me out of grad school this year, despite mostly good GRE scores, education in the field (prertty good GPA and subject GRE), an almost publication, and research experience.