I play as a Whirlwind-Barb. I'm currently using Grief (Phaseblade - WeaponSpeed: -30) on my main hand and Oath (Highland Blade - WeaponSpeed: 5) on my offhand. I am thinking to create another Grief in a Phaseblade. But I came across something really interesting on Diablo Wiki - Whirlwind:
Dual Wielding. The hit-check alternates between the weapons, producing an overall result of damage about equal to the average of the two weapons. If one weapon is slower, the frame rate will be adversely effected, so it's best to use two weapons with the same frame break (see below), or else just go with a single weapon.
This quote is very confusing and counter intuitive to me. Does this mean that a ww-barb with 1 grief phaseblade does as much damage as one with 2-grief phaseblades? Wouldn't it be great to use a good shield in the offhand if that is the case? In my current case: I should then remove the oath, because it does way less damage than the grief phaseblade. And my plan to create a second grief would be just a waste of a Lo-Rune? Can anyone confirm that?