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

Demons are fun to play (but challenging). It's frustrating when you choose Demons hoping for an interesting game, but you're up against popular choices like Hafiz, Wingael, Hagesh, or Vittorio. They could at least pick some less aggressive heroes. Demons have limited hero choices on small to medium-sized maps – only Deleb is really viable because a successful start without her is almost impossible (unless you get a chariot as quickly as possible). I think they're most difficult to play against Mages (even Deleb struggles against them).