Which hero do you like?

Yeah - what I like about Haven is that they have many additional mages, while Necropolis only has devils, and they aren't very good - summoning is a powerful thing, but it's one-time use. And Necropolis doesn't have any archers at all. And creatures are still preferable to vampires.

Exactly! This is one of the main reasons why I started playing mainly as Haven... Various tricks with teleportation and displacement were discovered later:)
I think creatures can only be built in castles, which are constantly under threat of attack, but not from the undead side (poison is still their important feature); although archers are very powerful.