Bump for more info. I, too, am looking @ these 2 scopes as well as the SWFA SS FFP 3-15x42.
Based on DStroud's post the SS 3-15 X will be in third place on glass clarity, as compared to the Sightron he reported and the Viper PST. The SS 3-15 is not in their "HD" line of glass, and the lesser clarity is immediately apparent when comparing it side by side with the SS 5-20 HD, and a Viper PST. Epsecially looking beyond 250 yards.