Namor wins.
Oh, but wait, Storm can command the electromagnetic spectrum and harness the power of Sun EASILY, without no effort. And there is jovian pressure field that is...something. And then she can apparently do this all, WHILE dodging the debris Namor throws at her with speeds that exeed 3000 mph with her eyes closed because she can now sense everything around her. She can also make tornadoes in the same time. Oh yeah, and she can close his heart if she is in the mood.
So, if we go by that description, Storm wins.
People are not sure.
Namor also possesses vestigial "wings" on both of his ankles by which he seems to fly. Since the "wings" by themselves could never carry Namor, much less anything else, it has been speculated that he uses the wings for steering and flies in some other manner, perhaps by telekinesis.
k, because I was thinking about the fight and it could go either way, but namor will more than likely win. but anyway I was just thinking that she could flash-freeze his wings because she had done it to angel before. but I hate to admit this..........namor will likely win because he has a wide variety of abilities and has more experience 🙁 . but storm does have a chance and could beat him 😄