Judging from all the highend content up till WotlK, avoidance is the answer in 5% of the cases, the other 95% mitigation > avoidance
Pumping everything into avoidance is never ever the answer so it shouldn't be referred to as the best option in a "Best-in-slot" topic, especially the meta is a gimmick one. _________________ http://eu.wowarmory.com/character-sheet.xml?r=Hellfire&n=Zaphara
There are two encounters in game at the momment where having a set of avoidance is a advantage over mitigation , those two are Saphiron and Malygos wich can and have been tanked by people without this kind of gear
So the question is , do you gear for 2 bosses or do you gear for everything else and to have more threat aswell ? at the time you will have four pieces of tier 7 25 man everything will be piss easy anyway ( if you die your healers just suck )
Also with diminishing on avoidance it IS the best idea to try and spread your stats as much as posibile
That being said I agree with most on his/her list save for a few things
: meta gem , chest and second ring
A better meta would be the 2% armor one if ya want something with stamina fact is fact most dmg from bosses is not their spells its their phisical attacks
While a chest with avoidance is good the fact is you would get more from the tier 7 one due to diminishing returns
Same goes for ring , badge one is better
So finaly this list gives a good insight , but I would ask moderators to not sticky this , its simply not the only way to go and its definitly not the best one
P.S. I know Sartharion could be counted as a slow hitter but he is so pathetic that it does not matter what kind of gear you use to tank him , that is until you get 1+ adds with him and then due to the buffs he gets a tank with bigger mitigation is better then one with avoidance