But that's still better than not hitting at all, which you would have done with only one attack roll.
Well, more accurately (H = hit change, D = base damage):
CSS = H(W + 3.5)
SBT = (1 - (1-H)^2)W + 3.5H^2
So if your base damage is at all decent, and/or the chance to hit is low, then SBT wins.
Forgot about the halving. Still, even 5' is often enough to move out of full-attack range.If you've no investment in Jump, you'll need quite a high strength to make DC 20 check with any reliability.