Hi everyone. I just registered and wanted to share my thoughts on this matchup.

If I'm wrong, please correct me. I usually play 1v1 with people on a map with the maximum level, meaning there are no starting money or resources. In this scenario, building Dead Nights or Knights from the Castle in the first or even second week is very difficult.
Firstly, Knights require a significant amount of wood and money, which means you have to focus on units and neglect building the 2000-cost structure, let alone the 4000-cost one (the economy develops very slowly).
By the second week, this will result in a shortage of money to simply buy Knights. In the first two weeks, I usually play with Archers and level 1 units in the Castle, focusing on gathering money and waiting for the Angels to be built (20,000 for Angels is also not easy to obtain).
The situation with the Necromancer strategy against the Knight is also not ideal. Dead Nights require Vampires, then Liches with their 10 sulfur and 10 gems, and then the Knights themselves, which also require 20 gems and 6000 gold. If the map is not rich in resources, it will be difficult to build Knights in the second week without neglecting the economy.
For Necromancers, Skeletons are the key in the early game. You buy 2 heroes and go around killing minor creatures on the map near the Castle. Then you switch to Vampires and travel with two heroes. One hero with Vampires fights and gives the raised Skeletons to the other hero nearby. By the second month, you can realistically gather 400 or more Skeletons.

Regarding who is stronger, it depends on luck. On random maps, anything can happen.
The only thing is that the Necromancer has only 5-6 useful levels, while the Knight has all 7. I consider useful those levels that I usually play with.

If we don't take magic into account, the Knight needs to try to kill the Necromancer as early as possible. The Knight's units won't increase significantly over time. The Necromancer will simply keep producing Skeletons in large numbers, and you'll be lucky if the hero isn't Galtran. (We don't play with Isra, Vidomina, Tanta, and Sir Murligh (unofficial rules)).