Just trying to see if i am on the right path

What is the general concensus on which one is better ?? http://www.wowhead.com/item=70933 http://www.wowhead.com/item=71021

http://us.battle.net/wow/en/characte...orazz/advanced

http://www.wowhead.com/item=71021 (the one with mastery). When you get yourself block-capped, the other one would be a nice alternative to turn left-over mastery into avoidance.