Necropolis or Castle (Which one is stronger?)

The weakness of Necropolis dragons is a myth. When the opponent moves every other turn (because their morale has dropped), and every fifth of their attacks ages the enemy, what weakness are we talking about? Zombies are the perfect unit for protecting archers. Ghosts steal mana, which is very dangerous. The double attack of crusaders and archers is certainly strong, but vampires are not countered, and liches are much stronger archers (even compared to monks).