RE: Drop away rests in general
I was faced with the same decision early this year after shooting prongs for several years. A couple of things did it for me:
1. I like shooting full helical for hunting situations. I wrap the feather as tight as a Bitz will allow and full feather clearance would be next to impossible to achieve under these circumstances otherwise.
2. Stability on the riser. I like to still hunt from time to time, and the fact that the arrow sits directly on the riser under my index finger makes it feel very solid and stable. Also, the arrow sits more securely on the riser than on a set of prongs while in a bow holder.
3. Quietness. I've got the Drop Zone wrapped with fleece and I can't detect a hint of noise even after the hundreds of shots that would have worn the coating/covering off of a prong rest.