Necropolis or Castle (Which one is stronger?)

Weak and ineffective units – it all depends on how you look at it. Zombies and ghosts are not as weak as they seem. Although they are inferior to similar units in Haven, they allow you to save money on their recruitment, which can be used for stronger units. For example, Death Knights will be more powerful (but also more expensive than Champions), and by not spending money on weaker Necropolis units, they can afford stronger ones.