AQUAMAN NAMOR SHARK POOL

Aquaman King Of Atlantis vs Namor King Of Atlantis

Aquaman King Of The Seven Seas Vs Namor The Submariner

The Dweller In The Depths Vs Imperiux Rex

Usually the arguments go something like the above, at least in the leading lines precursing some version of how the depths of story of one make up for the depths of plot for the other....

Dueling Oceanic organics, half human, half Atlantian, each 'magic-gilled' for part time land usage, able to breath air for almost unlimited amounts of time, yet needing water within hours to refresh...

DC Comics has the older universe, yet the younger weighted water-dweller, but not by much...

Namor, created by writer-artist Bill Everett , debuted in 1939, in the first issue of 'Marvel Comics' published by Timely Comics [ ...the company would end up 23 years later changing its name, in tribute, to 'Marvel Comics'...], at the time exciting future oceanographers everywhere...

While over at DC Comics, known then as National Comics Publications,  Arther Curry launched in the 1941 issued More Fun Comics #73,  created by Paul Norris and Mort Weisinger,