megatron blitz because he survived in the sun and also optimus prime in g1 picked up a boat with ease and megatron is almost the same strength is optimus prime or stronger. he also has lightsabered weapons which could do probable the same amount of damage as a jedi lightsaber.
@tronboy: Survived in the sun? show me proof please, i dont recall taht ever happening in the cartoon and haven't read too many of the comics so idk if thats where it came from.
As for picking up a boat with ease..not very impressive, Iron Man has better feats than that but Optimus has got to be stronger than him.