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

It's quite difficult for them, to be honest.

Is this in relation to Inferno vs. Haven, or are they generally considered to have a hard time against everyone?)))
I just got a bad impression of the faction because of all the stupid, unfounded statements like "Inferno is weak, they'll lose against everyone."
Is that really the case? Is there a faction against which people would say "Inferno is likely to win" or "I'm betting on Inferno"?