Hercules vs Magni
Everyone knows Herc but in case you dont know Magni is/was the asgardian god of strength. The son of Thor. Magni is stronger than Thor and his str is listed at immeasurable. He fought Desak powered by the destroyer armor pretty much blow for blow. He is immeansly strong.
Going strictly with mythology, Magni would be stronger as his strength was greater than that of Thor even when he was still a child and Thor was a grown man er god. Thor could lift the hammer but he needed the belt of strength doubling his strength to wield it in combat. Magni could wield it in combat without the belt.
The problem is we have no combat feats for Magni in Norse Mythology, only a strength feat showing his strength was greater than his father's even when he was a child. Hercules was highly trained in mythology. He was strong enough to do what Atlas could do and was also a highly skilled warrior. I'd give Magni the greater strength but I think Hercules wins in a fight because its some feats vs. no feats of battle.