This is interesting, but I think it speaks more to which "beachheads" companies are choosing rather than which markets they ultimately target. For example, with consumer vs. enterprise I suspect that when Dropbox did Demo Day they would have been labelled a "consumer" company although the enterprise potential was obviously there. Vertical SaaS is another example--choosing a vertical is an excellent way to start, and it can be enormously lucrative for a small team, but I imagine that "VC-style" exits will usually require branching past it.