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I definitely prefer Castle.
And what about the Necropolis? Its 7th-level unit is weak and doesn't compare to Archangels, which can resurrect and fly very quickly (I think they're the fastest). Plus, Griffin Conservatories are scattered across the maps. Dragons may sometimes age units, but they only affect very weak units, so their aging effect isn't very useful.
Living cavalry is almost as good as undead cavalry, and it can be upgraded for free in a stable on the map, and its ranged damage is increased.
Monks are just as strong as liches; liches may attack with an area-of-effect spell, but what's the point? I never position my units close to each other. And monks also have no food penalty.
Vampires are a formidable weapon against humans, but they are quickly eliminated or neutralized. At the same time, Crusaders attack twice and are very strong.
Zombies and ghosts are weak (the latter may drain magic, but in very small amounts), while humans have extra archers and flying griffins to fill that role and deal with everything.
The only thing humans can't definitively counter is skeletons. But you need to know how to gather them, and skeletons are very slow, so you can slow them down until a better opportunity arises.
And also, Castle has the hero Adel, who has innate diplomacy.
In the confrontation between the factions of Life and Death, in my opinion, there is a balance.
