I would rather have the AR platform if I had to choose between the 2, but
in the end Id rather have something in 7.62 NATO or 5.56 then 7.62x39.
Thats me though.
My only issue is that, too my knowing these are brand new platforms, and might have some issues. I also would prefer the 7.62 NATO round, but if I was to get a 7.62x39 I would go with the proven, reliable ak platform, not the new, unproven RRA platform.