^ What he said, let me straighten it out and dispell some myths.
First: Semantics, I think some of the confusion in this thread might be due to confusion in terms, specifically avoidance and mitigation.
Avoidance = Dodge/Miss/Parry completely avoiding an attack
Migitation = reducing an attacks damage, either through shield block or armor
Now, the reason why block isn't considered in the EHP calc is because (especially in ICC with the 20% dodge debuff making getting to the 102.4% mark nearly impossible even for paladins) it's not reliable. Even pallies don't have a reliable enough chance to block to consider it EHP, and that's why it's not included in the EHP calculation (and block is also calculated after armor when a boss hits):
EHP = HP/(1-%reduction from armor). The quick and dirty equality is 1stam ~ 11 armor, there's a bunch of decimals and armor actually gets better in the EHP calc based on how many HPs you have, so at higher HP levels armor is worth more, but the basic quick and dirty comparison without running to an EHP calculator is 1 stam ~ 11 armor.
For every other reduction effect it adds multiplicatively so you multiple the denominator by (1-%reduc) of whatever the other effect is and repeat for every subsequent damage reducing effect. It is multiplicatively added simply because if it was additive you could get over 100% dmg reduction. Armor also caps out at 75% reduction, but that's not really a point of contention in this thread.
Second: Pally and Warrior gearing is ALMOST THE EXACT SAME. There are only 2 differences:
1) Pallies get higher coefficients from agi, so they almost always use agi hybrid gems instead of dodge or expertise (especially since they get a base 10 expertise from glyph of seal of vengeance). They also get better returns fom mongoose due to higher uptime from SoV and better avoidance (and crit) coefficients from agi. I still am a firm believer in blood draining though and I will even advocate agi for warriors. It also is a tiny quibbling point because 10 agi or 10 dodge in a gem slot to hit a meta bonus is not going to make or break a tank.
2) They have a libram, we have a gun, DUH
As far as the stam/stam or stam/armor trinket debate, I recommend looking at http://www.tankspot.com/showthread.p...=misconception
The basic thesis is that you should use whichever gives you more EHP. I think the number is around 44k HPs buffed, glyph of indominability because better than heart of iron by about 2 stam worth of EH, making it about 164 stam worth. Due to the aforementioned EHP calculation you can see that armro scales with your total HPs, so glyph gets better and better, however it never passes Jug's Vitality in current content in terms of raw EHP, to my knowledge. However, the cooldown is also pretty good which is why I would suggest using it over brewfest trinkets and is more reliable EHP than say "The Black Heart." I would not use glyph of indom over the skeleton key or jug's vitality. I would use Unidentifiable Organ over The skeleton key on fights that don't have heavy magic components or maybe if I could reliably have stacks up all the time, but I can't actually think of a fight like that, maybe add tanking on gunship?!
There's no inherent benefit in using an armor trinket that gives you less EHP than a raw stam trinket, since while you will take slightly less damage, you will have more HPs than the decrease in damage you would take, and if your healers are worth their salt, that difference should still be easy to heal in current content.
"If the world is something you accept rather than interpret, then you're susceptible to the influence of charismatic idiots." -Neil deGrasee Tyson
Twitter @Aggathon || @Tankspot || Twitch.Tv/Aggathon