Odin is a god, Hercule is a demi-god (in Marvel. In the "reality", he's ascended (by the power of Zeus).
Odin know and use magic. Hercule don't.
Odin use magic weapon. Hercule don't (even if the mythological Gungnir is more powerfull. It don't destroy galaxy - Marvel is a "the only power is numbered in TNT" thing - but he can really decide who win a battle between mortals. Need "more than mortal" beings for go against that).
Odin has energy-blast/beams. Hercule don't.
Odin has the power of all his pantheon. Hercule don't
Odin has two powerfull godlike wolves (even if the real mythological one are better, because Marvel hate animals (but squirrels). Mythological wolfs are REALLY powerfull in germanic mythos. One can easily destroy the sun in one bite, and Fenrir is even more powerful). Marvel's Hercule don't even have his lion skin.