Lighter is "better" in 3D.....in that you can shoot a flatter trajectory. Flatter trajectory means you can be off in your yardage guesstimate (this is all relative to something heavier) and still maybe get the scoring ring you're after. That's the premise, anyways. Huntingson described why he likes it for a hunting situation.

Me....I like Bruce's explanation on why he shoots a heavy hunting arrow. I concur. With my effective range probably being even shorter than his. "Flatter trajectory" and hunting arrow don't belong in the same sentence for MY hunting situations. Non issue. I'll take the extra wallop a heavier arrow delivers....and my bow can push it.