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

I voted for the Elves because, in my opinion, they are the most difficult to fight. This is because they have strong archers, while the Demons consist entirely of infantry. Of course, portals help, but by the time they open, you can suffer significant losses. However, it's also not easy to fight against Humans and other Demons, as in this case, the opposite is true – they have strong melee units. But overall, there isn't much difference, as you can give everyone a hard time.