Which faction poses the greatest challenge for the Dwarves?

I believe that if there really wasn't any balance in the game, everyone would only play with the same factions and heroes. Or do you think that no one knows about the Paladin training on the anniversary patch? Many tournaments are held, and the best players, who regularly receive monetary rewards, never say that Dwarves win against Necromancers without a chance. Just play with the same Outcasts without waiting for 3 months, and you will understand that the same Dwarf can be defeated by a Necromancer. If the opponent doesn't have the opportunity to rush, the Dwarf is very strong.