Don't get me wrong, I love Namor. However, I think Aquaman would win this fight. They both have similar powers (both can swim at high speeds, talk to animals, etc.). However, Aquaman has earned many different fighting techniques thanks to his colleagues in the Justice League. Plus, I feel like he has developed the true strength of his powers... If that makes sense. I know that Namor can fly, however that won't help. Namor and aqua man both get stronger in water. If Namor flies, he won't have the water advantage... Because that's basically all of their powers. And that's why I think he would win.