Fastly becoming my favorite thread
http://www.tankspot.com/forums/f200/...at-values.html
SB does all of 36 threat. Since most mobs you care about threat on are immune to daze throw that out the window. 36 threat is roughly 7 ticks of bloodrage.
SB is off the GCD and costs 10 rage (7 with FR)
HS is off the GCD and costs 12 rage (with imp HS)
I think I know which one I'd rather use as filler.
Ofc, you can use both at once (and use a special!) but I think I'd rather pocket the rage for an avoidance streak.
Plus I would hate to be in the habit of throwing SB for threat then forget that there's something I should be interrupting on this one boss, but I realize that would be user error.