The only bosses I'd imagine you facing are the Mushmom family, making Double Shot better, however in most cases Arrow Blow is much better. It can potentially shoot 3 mobs at once, if you have a mob in front of you as a target and another above the above mob will be hit too (Normally not possible. I believe it's a glitch with targeting) and mobbing is just so much better than single targets. Arrow Blow also has replay value to it in later jobs. Before Chaos I used it on Pkirby a fair amount even though I had Inferno and Arrow Rain too.