Necropolis or Castle (Which one is stronger?)

I compared Vampires to champions for one reason – both build up in the first week and enter the battle in the second.
Is it easier to build Death Knights? Let's compare.
For cavalry, you need to build 4 structures with a total cost of 35 wood, 5 stone, and 10,000 gold. Cavalry is upgraded for free, i.e., for free in the external stable.
For Black Knights, you need to build 5 structures with a total cost of 20 wood, 35 stone, and 13,000 gold. By the way, upgrading them costs an additional 3,000 gold, plus 5 wood and stone, and 2 of all other resources.

All of this is true. The only problem is that there might not be enough resources at the beginning of the map, or if there are, it will be just enough to build all these levels. The question is, what to do at the beginning of the second week when there is no money.
This strategy can only be implemented when you see that there are enough resources to invest 2,000 in the second week; otherwise, you give your opponent an advantage due to slower development.

It's easier with Vampires. You build them in the first week. But Vampires need an upgrade as much as they need air, and that's already 10 crystals + 10 gems. No matter how many times I've played, it's rarely possible to build an upgrade at the beginning of the 2nd week (usually the end of the 2nd, beginning of the 3rd). Without an upgrade, Vampires are nothing, just... support for skeletons.

When the game is drawn out, Necromancer can have two arguments – skeletons and vampires, while Knights only have one – Archangels, but a very powerful one. However, this argument is supplemented by a second – greater hero mobility, which almost equalizes the chances.

We can argue about the mobility of Humans. I agree that they have more speed and a stable. But you can't fight as effectively with just cavalry as you can with Vampires. By the second month, the Necromancer can go wherever he wants. 32-40 Vampires can kill quite large troops (they huddle in a corner and attack one group at a time). Cavalry, even though they run well, it hurts to lose them.

In my opinion, it's not worth dragging out the game with the Necromancer. If there is an opportunity to attack, you have to attack.

The advantage of Humans is the ability to travel with almost all types of troops without fear of encountering an enemy. The Necromancer travels with Vampires + skeletons, and the second hero's troops are behind. Plus, Humans can summon Angels in the Angel Hall (the most reliable support for Humans). Necromancers try to compensate for all this with skeletons.