Depends on what I am doing. Generally, I like to keep my weapon flip for MH Axe or Greatsword burn all my CDs/rage and back out to the safety of ranged once more till refresh.
Sword/Sword is really close to being the highest DPS for a Warrior. Big flaw is you have to really stay in that stance and it's a lot of DOT damage. So realistically it's not something you will ever see your true potential realized with. But the speed and damage for S/S is really godly.