Necropolis or Castle (Which one is stronger?)

Forget this Necropolis... Once, I attacked 35 spectral dragons... I was TERRIFIED, I thought it was the end... But their strength turned out to be roughly equal to 10 archangels. Well, and I defeated them without losing anything, although it was just an auxiliary hero, and he had exactly 10 archangels, 3 inquisitors, and he himself was level 5...

And, note, this is despite the fact that I chronically can't play as humans, although I have repeatedly tried to befriend this glorious race. But Necropolis works quite well for me.