Bias all aside. Captain America always made it a point that everyone who wasn't an adept hand to hand combatant learned the basics of fighting.( Even those who were, trained regularly in groups ) From Scarlet Witch, to Spider-Man. He always emphasised that they might not always have their powers and that it could come in handy. In fact he forced training sessions without powers. Has Superman or Batman ever implemented such a program with the JLA? I don't recall if he has. If someone knows whether he has....then please, inform me. Otherwise...I'd have to say Avengers.