I think Namora has the strength advantage, but I think Archangel might be faster. If he manages to clip her wings then that would take away her flight. But in a coastal battle setting, she can simply go in the water. But then that would probably stalemate the fight.
@matchesmalone21: Thanks for the info on Attuma. Does his blade have any special abilities? Can it fire energy blasts or anything out of the ordinary?
Also, in regards to Ocean Master, shouldn't his trident and helmet be considered his standard/basic weapons since in his first major appearance within the DCnU 52 he used them both? If he had multiple appearances already within the nu52, then I can see them not being counted. But since he has only just appeared and was shown using them both, I would consider them to be apart of his standard/basic weaponry.