It is funny how you assume that he has any gear on him and claim how off hand is no more than a stat stick @Sprotess.
I dont know about you but, from what I know, off hand weapon damage is what gives you Rage, and Rage is really important for a Fury Warrior.
If you que HS or Cleave, your off hand will hit 100%, WW also gets buffed by off hand damage, WW and Off Hand white hits are a big chunk of Fury Warriors damage done, so...
@danirodas11
If your warrior has pre Icecrown Citadel gear, and/or is naked, the best item for you will be Glorenzelg for a long time.
If you are going to farm a lot of dungeons and pre ICC raids for gear, the best item for you will be Glorenzelg.
If you are not Expertise capped, the best item for you will be Glorenzelg.
The only point in gearing where DBW would be "better" is if you are at ~1240 Armor Penetration rating from gear with Cryptmaker or Mace of Menethil or Shadows Edge in off hand.
You can farn http://wotlk.cavernoftime.com/item=47214, buy http://wotlk.cavernoftime.com/item=42987, get http://wotlk.cavernoftime.com/item=45609 or http://wotlk.cavernoftime.com/item=45931 with points, which are far better trinkets for RDF farm due to higher uptime than DBW.