RE: Kinetic energy
I agree with Bees . . . I am a firm believer in Kinetic Energy. I see it as a mathametical combination of Mass and velocity. If however both of your arrows arive at the target with the same KE the choice would be whichever you want. However, such an equality is highly unlikely.
I am an aluminum user and don' t plan to change. Two weeks ago we shot a new 3-D field course near where we live. What I came away with was an education and a confirmation of this decision. We didn not find one of the 30 target areas that didn' t have numerous broken carbon arrows laying around . . . but there was not one broken aluminum arrow anywhere to be found. I' m not knocking carbons, just stating what we saw.