
Originally Posted by Feebs
You indicate that the battle between Sta and Mastery is close whereas I would have to disagree with you. I don't have a WoL comparison at this time, however I can say that in the field, there is a definite difference in stacking sta vs stacking mastery. The short of it in my experience is that while stacking STA I have more HP to heal and burn mana on that ping pongs up and down vs having 10-15kish less hp that remains steady and drops predictably. I regularly take less damage than any tank that I tank against that may or may not be gemming/gearing for avoidance.
Although common sense may not be an acceptable form of evidence, I'm fairly certain that once we have the ability to block cap through whatever sacrifice to HP, this will become more apparent. Although we can't "avoid" any large magical damage that can only be soaked by HP, I'm finding that Divine Protection is off cooldown for almost anything that can kill me. If for some reason there is a large unavoidable magic attack in heroic modes that for whatever reason I wont have the HP for, then I'll simply reglyph Divine Protection for 40% magical damage reduction given that melee hits will not be an issue post block cap.
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Feebs,
Certainly, once you have enough stamina that you can't be burst down stacking damage reduction is arguably more valuable. However, unless you've got extensive experience with Sinestra, I think its fair to say that no one actually knows how much Stamina that is, or if its even at a level that's achievable in current gear. More mundanely, your "safe" stam level will be substantially affected by your healers. The question is how to gear given uncertain knowledge, and I have seen no sign of a emerging consensus.
Additionally, while Mastery is GENERALLY superior to avoidance, Padwicin's post below is an excellent reminder that there are always exceptions.
EDIT - This is unrelated, but I just realized that another way of looking at the belt would be dividing the 60 damage/second saved into the 0.45% damage saved from mastery, which gives a 13k dps equivalence. That is to say, if you're taking more than 13k incoming dps from blockable sources, then the Mastery (and by extension, STAM from another profession) is superior, while if its less than 13k then the belt is superior.
However, I have not tried the belt decoy yet, and I'm curious to see how it stacks up.
EDIT2 - Tried out belt tinker on Julak-Doom, the rare spawn in northern TH. Didn't take a real log, but eyeballing the results, I believe the dummy's timer ran out before it died (JD only hit me for ~9k after mitigation, so his melee is really soft), which is pretty spiffy.
In fact, its absurdly good. The 5 sec cast time is incorrect (its actually instant), anecdotally it can't fail which is nice (I got the +Crit fail against Halfus last week, which was exciting, but we didn't start the log until later in the night, and I don't recall him actually critting me), it absorbs 75k instead of ~18k and it has the same 5 min cooldown.
Certainly I can think of situations in which the Plasma Shield would be preferable, but for most of the time, the Cardboard Assassin seems clearly superior for most situations.