I would have to say it depends on your team for me. If you have a good feint stacking team and a storm 2 Morganthe runs can be finished very easily. While a good storm offensive team with one or two jades, (depending) can easily beat Hades.
Hades is much harder. Morganthe is just four 26k health bosses. Whoop dee do. Hades has annoying cheats, especially mr you can't trap me Poseidon. Try doing Tartarus with a storm hitter without shadow.