Necropolis or Castle (Which one is stronger?)

Personally, I find Necropolis to be stronger. It has necromancy, which allows you to create skeletons without buying them, which is very convenient for large battles. My hero in Necropolis is Tant, and he has the special ability to revive the dead, which is useful for me. As for Castle, well, it's just a Castle; I rarely play with it.