highest melee damage per secound in game
When you are attacking a lifeless corpse? How about when you are attacking an enemy that is blocking your attacks, and thus staggering you, or when you are being attacked by multiple enemies, thus staggering you,
and you cannot block to stagger them and thus get fewer attacks off on them because they are never staggered and thus blocking more.
I would wager you probably get more attacks off with a one hander and shield because you can shield bash enemies and knock them down or stagger them, then you get several successive free hits off on them.
There are also no dual wielding talents. There are one handed talents, which apply to using a 1h and shield as well. There is no benefit to dual wielding whatsoever.