I was originally gonna vote for Jason, but then I read through some more. Since Jason is afraid of water (Though it's in one movie, but not the other for some reason), Aquaman would seem the best choice since he could just hop in the ocean and call a shark or something. Even if the Jason we're talking about isn't afraid of water, Aquaman could still "lure" Jason into the water, have some Atlantean fighters (Or again, sharks or something) gang up on him. Also considering his speed underwater and his strength, it works very well. Even on land, Aquaman could still use his trident and super-strength to counter Jason.