2 handed slash vs dual wield

[kiel76]

Hello all. Newbie back to the game after many years and I must say I've missed it. It's good to having consequences to death and actually having fear of roaming the world again!

So I have a level 13 warrior. Early on someone was nice enough to give me a Nathsar Greatsword 17/30 weapon. One kind of weapons would I need dual wielding to keep up with that. I've completely forgotten the dps mechanics of dual wield. Any help would be greatly appreciated. Thanks again!