Namor would eventually win.
They're roughly equal in strength & durability.
Namor has flight, speed, fighting skills advantage over her.
Not to mention experience (fighting the good fight since before WWII).
Got to give this one to Atlantis' Avenging Son.
Marvel/Timely Comics' first superhero. (1939)
She-Hulk has defeated him at least twice to my knowledge, but of course one was during her time travel back to the 40's to prevent some A-bomb incident (something like that).
namor defeats hulk. your smoking some goood sh**. Hulk owns namor pretty much the while avengers. she hulk will pimp slamp his as and turn him into tuna sandwhich.
Namor has defeated the Hulk by getting him in the water.
They fought once when Namor tracked down Hulk to some beach
and made him an offer to destroy the Avengers. Hulk got all "BAH"
then Namor got him into the sea and whooped him EASILY.
Namor's not just another strong guy. He can fly, has experience
fighting since before WWII, has exhibited the ability to generate an
electric shock on more than one occasion and gets "refreshed" just
by getting in the water. He's no pushover. He's an O.G. Respect.