My opinion is that for pure threat gains, +hit up to the cap is a cheaper way to get that done. Over an extended time line, +hit up to the miss cap will correlate into threat directly via a %. If you remove 2% miss from your table, over time, that will equate to 2% threat.
But, SBV not only gives threat, but also mitigation at the same time. Which increases it's value. Another nice bonus of SBV is that it helps burst threat.
My feeling at this point, without a lot of in-dept testing, is that +weapon skill is the biggest boost to threat for a warrior tank. I know that people have been discussing the actual implications of +weapon skill, but a blue post (probably wrong, but it's all we have right now) indicated these numbers:
Taken from:
http://forums.wow-europe.com/thread....geNo=1&sid=1#2
I wouldn't say it's useless.
Let's say you increase your weapon skill by 4.
Against a mob 3 levels higher than you, you get: 0.8% lower chance to miss, 0,4% lower chance to get dodged, 2,4% to be parried, and a 0,8% higher chance to crit. That means a 4,8% net increase.
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