A number of us know MySQL fairly well, and in particular I've seen how it's used by some of the biggest internet companies. We have some postgres experience on our team as well, but it's a little more of an unknown. So experience trumped feature set in this case.
One thing I would say about postgres is that it has a lot of features. As a new user, it's hard to know which ones to use in which ways, and what the downsides might be.
One thing I would say about postgres is that it has a lot of features. As a new user, it's hard to know which ones to use in which ways, and what the downsides might be.