Against which factions is it easier for demons to fight, and against which is it more difficult?

demons are the weakest. It's better to avoid Elves and knights by taking a detour. And Dungeon too. I remember how in the "Railag's Offer" campaign I was killing demons. They didn't even have time to make a move!:rolleyes:

And were you playing against a human opponent? Believe me, a person who plays demons a lot and well has enough to surprise Necros, Mages, and Dungeon alike. On small maps Deleb is more than a dangerous opponent, Grok is a fast-moving hero who can actually build up to their ultimate (which, by the way, is very scary for demons) faster than anyone else in the game, and in battle can present an army not inferior in number to Necros's best armies, and if I'm not mistaken Alastor (a hero with magic resistance) is simply a walking problem for mage opponents.