Stamina, avoidance or armor trinket

[superworm]

In fact this is an issue I'm considering for my dk alt, as my pal has generally retired. Anyway, I mostly use the next 4 trinkets:
Corroded Skeleton Key http://www.wowhead.com/?item=50356
Corpse Tongue Coin http://www.wowhead.com/?item=50352
Glyph of Indomitability http://www.wowhead.com/?item=47735
Bubbling Brightbrew Charm http://www.wowhead.com/?item=49118

Generally I stick to Corroded Skeleton Key as it's amazing health. The other 3 is hard to choose for general use, however.
I understand that for Gunship Battle and Deathbringer, Corpse Tongue Coin may be better. But its proc(+5712 armor) is not so good imo. Without any buff, my dk has 28324 armor, and with an armor potion and Unbreakable Armor, I would have 40254 armor. Considering the raid buffs like MotW, Devotion Aura and Stoneskin Totem, I'm pretty sure that I could not have the full benefit from the proc as the armor value would exceed the cap of 45697.

The Glyph of Indomitability has a large amount of armor and the on-use effect is also very good, but it doesn't mitigate spell damage. And strange it may seem, the tankadin2 addon tells me that Bubbling Brightbrew Charm is more EH than Glyph of Indomitability, not counting in the on-use effect.

[Khayne]

You only tank normal dungeons in that gear then?

Do notice that your listed Armor Cap number, is for lvl 80 mobs (i think). lvl 83 mobs (raid bosses) you do benefit from armor up to allmost 50k (think it was around 49900 or so, deffo more than 45k)

Out of those, i'd use Corpse Tongue as 2nd trinket, and maybe try get Juggernauts from ToC for EH set.

[blakk]

Keep them all on you and swap out depending on the encounter

[superworm]

You only tank normal dungeons in that gear then?

Do notice that your listed Armor Cap number, is for lvl 80 mobs (i think). lvl 83 mobs (raid bosses) you do benefit from armor up to allmost 50k (think it was around 49900 or so, deffo more than 45k)

Out of those, i'd use Corpse Tongue as 2nd trinket, and maybe try get Juggernauts from ToC for EH set.

My bad. Thanks for the reminding. Now I do use armor trinket for dailies and corpse tongue for raids. They always appoint only one disc priest for my heal, and he somewhat sucks, so I would expect a high procs ...