It also applies to characters using the Bo9S. The moment you hit +6/+1, you need to choose between making a full attack or using a standard action special ability, which ignores your /+1 attack.<br/><br/>If you're making a full attack, Rapid Shot is definitely better. It allows you to shoot at -2/-2/-7 compared to your highest BAB, so +4/+4/-1 at level 6. Manyshot only allows -4/-4 compared to your highest BAB, so +2/+2 at level 6.<br/><br/>Manyshot however only takes a standard action. For example, if you need to move around, you can still make a Manyshot after moving up to your base speed. When you are under a haste effect, you can also use Rapid Shot for your full attack, and Manyshot for the extra haste attack, since haste grants an additional action, or make two Manyshot attacks and still have time to move for example.