Reactives should hit harder because of the reaction off the dry boards of the backend. The ball accelerates off the backend, diagrammed best by a pearl ball, and shoots the ball towards the pins harder. On the other side, I'll carry every mixer with a plastic ball that I will with a reactive ball if they're both the same weight. Plastic balls don't seem to have the charge sometimes to set up in the pocket. 10's are more prevalent with plastic, but if a ball is thrown straight, both plastic and reactive will hit the same. Hit doesn't necessarily equal carry. I will guarantee you, however, that plastic will carry more 8's and 9's though, because it doesn't drive so hard through the pocket, everything deflects like it's supposed to most of the time, unless you have backends that are like sticky insect pads. I think that people have a harder time getting to the pocket with plastic though, and that the dynamics of reactives make them hit the pins with more energy. Plastic balls don't produce energy to begin with, the cores of the reactives create energy by the rotation. Plastic doesn't have anything to get it going.
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