Glyph of Indomitability is a very good trinket atm. Bonus armor is extremely useful because of the chill of the throne debuff (you avoid less -> you get more hits -> armor mitigates more dmg). Personally on my warrior I'm using it now with the Corroded Skeleton Key. Those who think armor isn't a good stat, need to do some maths. Also the 6.5% extra dodge from the Glyph of Indomitability's use effect isn't bad either, if you use it on cooldown it has 16.66% uptime, or it can easily save your ass, if you don't spam it on cooldown, but use it when it's really needed. Or for example on Saurfang since you tank 50% of the time, if you use it properly, you'll have the effect up 33.33% of your tanking time.
The following numbers are the stats of my warrior (the same goes for a paladin tank) unbuffed :
- with Glyph of Indomitability 29791 armor = 66.17% physical dmg taken reduction. So a hit will hit you for 33.83% of the initial dmg.
- with any other non-armor trinket 27799 armor = 64.77% physical dmg taken reduction. So a hit will hit you for 35.23% of the initial dmg.
Some (not to bright) players would say it's a 1.4% difference (35.23 - 33.83), and therefore they say everyone that armor is a bad stat. BUT actually it's not true, it's a 4% difference! Let's say a raw hit would hit you 100,000 dmg. Without the extra armor trinket you'd get 35230 dmg, with with extra armor you'd get 33830 dmg. 33830 is 96% of 35230 => you get 4% less dmg with Glyph of Indomitability.
Note that these numbers depend on your armor rating, with my current stats, it's 4%, if you have more/less armor, it can be ~3.5%-4.5%, I also didn't calculate in raid buffs (armor totem, mark of the wild, indestructible potion), which make this even stronger before you hit the 75% armor cap, which you probably won't hit.
Ofc armor isn't a good stat for the fights where you get a lot of magic dmg, since it only reduces physical, but dodge/parry does the same. That's why many endgame tanks aim for high armor these days.
However about the dodge trinkets, the chill of the throne has NOTHING to do with it being good or bad. The only case it's bad because of that, is if you have less then 20% dodge outside ICC, in which case you shouldn't even think about tanking there... The debuff gives you -20% dodge, that doesn't mean dodge is bad, or it's useless... you need avoidance, and in the matter of fact that debuff makes dodge even more valuable then parry : you'll have more parry then dodge probably anyway, so diminishing returns will make parry even worse. (On a sidenote dodge is better then parry even outside ICC, this mechanics just makes it even more better).
Also the question "which trinket is better?" can't really be answered. It all depends on the boss you're tanking. For example on Saurfang you want to maximize your avoidance (dodge/parry) even if you lose some HP/mitigation/aggro.
I hope it helped.