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

It's a pity that the demons were made, let's say, not very strong compared to other factions (although maybe I just didn't play with them enough), just like in the third game... But in the third game, Inferno and Swamp are new factions, after the second game, and that's why they were made weaker to avoid unbalancing the game. And when they realized that they turned out to be weaker than the others, they introduced the Conflux, which some call a "cheating" faction... IMHO)).

Weaker means more difficult, and the more difficult, the more interesting it is)).
P.S. The faction is interesting, although at first glance it doesn't seem very appealing.