CornPlanter
Emperor
I know the theory, one is for fast expansions and the other one is for "tall" empire. However usually by the time I get 30 culture I haven't seen nearly enough map to make an informed decision. I.e. last game the map looked empty and I took Liberty, lo and behold the very next turn 3 civilizations met, could barely fit in 2 cities. When I am lucky and can get those cities going always prefer large empire, it's allegedly 4x game after all, but how do you know you are going to have enough space? Any signs to look for?