Necropolis or Castle (Which one is stronger?)

In the third game, I always considered Necropolis to be stronger. But once, when I played with a human ally (I was Necropolis, he was Haven), the humans showed themselves to be stronger. He was able to handle those who were too difficult for me. But here, such factors played a role – he had diplomacy. True, I raised free liches. And still, only through joint efforts did we complete the map (he took my liches and, with their help and his army, defeated the enemy). So, the question is debatable. Necropolis is strong, but humans are often given diplomacy. And then...