My problem with using the commendation is dropping SMI and remaining crit immune. I do not use any resilience in my tanking setup and do not have an extra 32 defense to remove the shadowmoon insignia. Off the top of my head my only options for removing the SMI is obtaining Season 4 PvP bracers and gaining 10 defense via gemming or enchanting shoulders with defense. If I obtain the ring from m'uru I should only need the bracers for crit immunity.
My second and more favorable option is changing my defense elixir to ironskin when I need the armor of tenacity coupled with the survivability of commendation. This result should offer 10-20% more threat by using stanchion over wildfury.
For non-radiance bosses I would look at SMI, tenacity/moroes, and stanchion.
For radiance trash season 4 bracers, stam trinket, commendation (if I really care about survivability on trash).
For radiance bosses I will look at tenacity, commendation, stanchion, ironskin elixir.
For radiance bosses i'm lazy with, SMI, commendation, wildfury or pillar if there's healing to spare
To mijae I believe SMI has about a quarter (0.25) percent more avoidance than the pocketwatch. The crit immunity is what makes this trinket so popular as immunity can be obtained without resilience. I am interested in how you and your warrior are taking similar damage when you stack survivability and the warrior avoidance, my warrior counterparts and myself are opposite and I still take more damage than them.
How many priest/shaman/paladin healers do you use? are they specced for armor increasing heals? does your warrior chain ironshield pot? These reasons might makeup the difference.