Necropolis or Castle (Which one is stronger?)

these are the two strongest castles. Everything really depends on the combat tactics and circumstances.[/QUOTE]

I disagree. There are no strong or weak castles, there are only people who play poorly or well, as well as various circumstances, and of course - the great random (fortune itself).

Added after 2 minutes

If we consider only the units, it seems to me that Necropolis is slightly stronger. The undead have more powerful abilities. For example:
1 Death Knights' curse and double damage are constantly useful, while the cavalry charge is only at the beginning of the battle (you wouldn't keep charging a Champion into all units, as you'd lose the entire squad to counterattacks)
2 Dragons are obviously weak, but if Aging triggers - you can say goodbye to your unit:smile34:
3 Liches beat monks with their cloud.
4 I am always afraid of Crusaders with their two attacks, but there are vampires for them. Vamps will weaken first and then finish them off, all while resurrecting along the way.
5 Skeletons might be weaker than halberdiers, but SO MANY of them are resurrected.
6 I don't like Zombies myself; this is a big plus for shooters.
7 Griffins are certainly stronger than guards, thanks to constant counterattacks.

As for me, I see more advantages in the Castle, although I admit Necropolis wins in magic and, honestly, I fear a Necropolis opponent, specifically their skeletons. For me, Necropolis is the most formidable opponent (if considering only the army and castle capabilities).