Demons of the Ancient World: Balrog of Moria versus Chernabog
Chernabog is the canonical name of the winged demon that appears in the Disney movie Fantasia in the "Night on Bald Mountain" sequence. http://disney.wikia.com/wiki/Chernabog Might just be the coolest Disney villain-monster of all time.
Versus Durin's Bane, which one wins in a one on one fight? Place your bets. A bag is like a hole that you can carry with you.