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1. Imp - gremlins; gremlins are better, but the same perspective applies to imps in terms of potential. 60/40
2. demon - gargoyle, 50/50, gates and blast versus flight and hells
3. hounds-golems, 50/50, own-turn attacks and area effect, but low defense against resilience
4. sugub - mage, fifty fifty, too long to explain
5. nightmare - djinn, 60/40, fear and range versus casting and initiative, but few hells
6. pitlord - rakshasa, 60/40, rain and low initiative versus health and power
7. devil - titan, 30/70, I don't know what to use against ranged attack, casting, and power, but they are few and stupid.
Thus, due to titans, better hero development, and the creation of mini-artifacts, victory will still go to the mage IMHO.