Gotta say, wasn’t expecting Thor admitting Herc was the “slightly” better fighter. Guess Odin’s lesson in humility actually paid off.
Even if you accept Oeming's interpretation from that comic that Herc is a better hand-to-hand combatant, you have to remember that that occurrence happened when Thor was very young. All meetings since then (or, in other words, ALL of their many fights in continuity) have shown them to be absolute equals when fighting hand to hand.
So, either Oeming was wrong to have Thor state that Herc was better or Thor has since bridged that gap to become Herc's equal in modern times.
Take your pick.