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

In my opinion, it's most difficult for demons to play against Sylvan.

Why?
1. Archers can be neutralized by jumping demons or targeted from the first turn with fire-breathing hounds...
2. Demonesses can hypnotize the desired stack to the demons' side.
Inferno's hellhounds can scare any stack they attack, thereby disrupting the defensive formation of the Light Elves (for example, Unicorns or Ents can be driven away from protecting the archers).
And I think it's unnecessary to say that the demon army moves faster and fights in melee more effectively than the elven army.
Devils and Imps are not immediately available - but they can be summoned or called forth by devils from the slain...