Enchant Shield - Major Stamina vs. Block Rating

So yesterday while I was farming Shattered Sun rep for the new shield I was wondering if I could have some other enchant on it rather than Major Stamina, and to be honest I didn't even know there was an enchant like Block Rating.

Anyway, I was thinking that Block Rating should be better than Major Stamina since the block enchant gives 1,9% block, which gives both avoidance and threat - even if its very minimal -, while 18 stamina only gives me a larger HP pool. Not that stamina is bad, ofcourse not, but all in all I belive that it's better with block rating, seing as it's one of a paladins most wanted stats.

(Sorry if this has been asked before.)

Thoughts?

Not if you're uncrushable it doesn't... you are uncrushable right?
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Screw block rating. Screw block value (maybe). What content are you tanking? And which tank set is this piece gonna contribute to?

If you're uncrushable, it's a pointless enchant in single-target tanking.

For multi-target tanking, Tough Shield is better.

So, basically, for an uncrushable tank, it's worthless.
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There are reasons to use it. 18 stam for 18 br...using the figurine of the colossus instead of a 51 stam trinket is a bigger waste and people still do that. Do what you want.
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Saviorself - 70 priest
Expriest - 70 warrior
Wafflez - 63ish priest
Crittoris - 66 pally and rising!

With the +1.9% block chance, you could replace some defense/dodge/parry with something else that you want.
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Um what you lot on about last time i looked it was BlockValue not rating? have they changed it again to blockrating? I have no way to check this at work so may be completly wrong But i put this Block* on my ZA shield to aoe tank in MH and put stam on my hardened heart sheild.
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http://eu.wowarmory.com/character-sheet.xml?r=Bloodfeather&n=Erlata

Just to clarify, in simple terms.

Any avoidance/mitigation you gain after uncrushable results in more block rating being pushed off the table.

For example:

Defense: 496(5.84%)
Dodge: 24%
Parry: 16%
Block: 28%
Avoidance/Block: 108.84%

You actually only have a 21.56% block chance when holy shield is active. At this stage the Libram of Repentance becomes worthless for single target tanking, seeing as how all it does is add more block rating.
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I tend to tow the uncrushable line as tightly as possible, and I end up with more stamina getting the block rating than I would from the stamina. All depends on your gear which will work out better for you.

There are 3 enchants in question.

18 stam
18 block value
15 block rating (there is also a 10 block rating enchant, which is very rare, dropping in scarlet monestary)

All of these have been available since the release of TBC.