Which caliber for the Prototype Build 7.62x39 or 5.56 Nato

Which caliber for the Prototype Build 7.62x39 or 5.56 Nato?

OK Pandemians, I want to hear from you on which caliber you would like to see a build I have nicknamed the "Prototype" chambered in.  At this point I have a hand selected pre-anodized set of a la naturale receivers from American Spirit Arms, an Ace Ultralight stock, Barnes Precision Machine part…