Do you prefer having defined good and evil, or do you like it morally grey? High magic or low? Dark ages technology, or Renaissance? What else do you like in a setting/cosmology? What's your personal preference?
I'm the same way. It's not that I'm "looking for" a particular sort of cosmology. A game with lots of grey is fine, if it suits the setting. A game with a very strict good vs. evil divide is also fine, if it suits the setting. I just don't want to be in a game that bills itself as one thing and then delivers another.