I'm guessing that while different schools have their own specialties, there are probably general trends regarding the competitiveness of the various AOIs. For example, if there are plenty more applicants for philosophy of mind than philosophy of aesthetics, it should be harder to get a spot in a top program for the former than the latter (provided, of course, that there are a comparable amount of spots available for each AOI).
Does anybody know whether this is the case? And if so, which AOIs are more competitive than others? I would imagine that mind/ethics/epistemology/metaphysics are rougher than, say, logic/math/ancient/science?