BV is much cheaper than STR, but STR is still better per itemization point. I'd point you to my maintankadin thread, but they've taken the site down for upgrades temporarily. Here's the plot I would have pointed you to though, from the 3.2 analysis:
As you can see, despite getting 3x more BV per itemization point, STR still wins across the board. This means that 10 STR will always be > 30 BV up to 2400 BV, and gets far better afterwards.
Also note that after around 3000 block value, you're better served by stacking hit to the melee cap (8%) before returning to STR again, because the threat you get from the 2 STR -> 1 BV conversion diminishes the same way block value's threat does.
As a side note, this is going to change even more in 3.2.2 thanks to the TbtL change. You'll gain an additional ~1.5-2 DPS per point of STR, making it even better yet than BV (and probably Hit too, even under cap).
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