This is what I am talking about when I say Namor is underrated. Where is all of this Diana stomps shit coming from? His not a pointy eared Aquaman people.
Even decades ago, Namor was stated to equal Hercules when they are at full strength. His actually shown to be stronger at full strength once. And I consider that to be the bare minimum when his at full power. The former. The only being that has seemed above Namor consistently throughout his history is Thor from what I know of Namor, and well, Thor is Thor so that's fine.
Namor would be basically be at full power or close to it for most of the time here. Wonder Woman's faster, and more skilled, but I'd say Namor is more versatile. In this environment his also stronger.
It's a pretty good fight.
If it ends up being an underwater slug fest, Namor wins. Plus she can't breathe underwater forever as she herself recently admitted I believe. Even in the air, with the water being so close and Namor having his current wetsuit, I'd say going in a slug fest is not in her best interest. Based on how well Namor's done against powerhouses I'd say are stronger than Diana on land. Especially Hulk. Namor has a terrific track record against him. He looked superior in their first scrap, beat him with a whirpool underwater in their second, defeated him in a slug fest in their third, and stalemated him in their 4th above water. If Diana fights smart, using her superior speed and skill, while keeping it as far from the water as possible for as long as possible, I can see her winning, but it would be hard. I believe her biggest and most important edge is the speed edge.
If anyone want's to learn more about Namor just check out Liam's respect thread. It's pretty good.