Necropolis or Castle (Which one is stronger?)

Morale was boosted by Archons and Archangels. And fighting against a hero who is joined by dozens of Archangels and hundreds of Griffons, not to mention smaller units, is difficult. It was simply an unfavorable situation for my Necropolis faction. If the Humans hadn't had diplomacy and so many neutral units willing to join them, things would have turned out differently.