Well, that's interesting cassus. SoaB gives ability to deal more damage, and Fin(2) to fire faster, thus deal more damage. Well, with SoaG (3), DG and SoaB (3) you fire at 60% normal time, that's 0.6s. In 3 s period you're able to fire 5 times, and with Fin (2), you fire even faster, something like 0.4s, so in this same period you would be able to shoot 7.5 times. Assuming, that you hit with all bullets, in first case you would deal 5x(2d4+6), so on average you would deal 55 damage. In latter case, you would deal 7x(2d4+3), average- 49 dmg.
Well, SoaB seems to be better:P