Which faction poses the greatest challenge for the Dwarves?

I really don't understand the logistics of why you would take them. Attack – only if it's because of Battle Frenzy, but otherwise, what's the point? What upgrades do you take – skeletons-archers, plague zombies, ghosts, Vampire Lords, Greater Liches (if you have the Necropolis, then Archliches), Death Knights, spectral dragons.

Well, you're quite the noob, buddy:
1. Skeleton-archers are only for amateurs.
2. Logistics gives you an advantage in advancement, development, and leveling up +30%!
3. Luck is generally considered the best skill for all races! It can't possibly be useless (attack + ~50%). Soldier's Luck doubles the chance of stunning (in 3.1, the probability check is already performed 3 times, and with Soldier's Luck, it's 6!!!, i.e., almost guaranteed with a relatively large stack of vampires).
4. Why wouldn't a Necromancer use magic? First, mass spells of darkness are cast (magic doesn't work on them). Well, and then you can already have some fun with higher-level dark magic.
5. Is protection against chaos magic an essential skill for a Necromancer in your opinion!?

I suspect you've never participated in tournaments and play by choosing opponents so as not to lose... Otherwise, you would know more and wouldn't shout about how you play, as if it were the ultimate truth...