I shoot 3under and wished I started out with split. I could't imagine changin now. Most bows are tillered split, and are quieter shot split. Your putting the force right behind the arrow. Where 3 under you are not. Usully you can tune out any problems by raising the nock. But I have seen times you can't.

With that said, 3 under is easier to shoot gap at distances close from 5-20 yards,