Also, not sure about those specific PSU, some have in line capacitors etc...it is possible one of those may have it and one not. More than likely it is all the same, but no guarantee without looking into it.
Gold to platinum efficiency gain is so small you will never make the ROI of the unit. Depending on how much power you draw you can actually make better efficiency gains by going down in total power due to how the efficiency curves are. My 1200W doesn't go much over about 45% under a stress test let alone typical browsing or gaming.
I'd be better served by something in the 650W range now as an example.
Hardware Canucks is focused in-depth reviews of the the latest graphics cards, CPUs, storage, smartphones, notebooks and gaming peripherals. Join us as we unbox, review and benchmark the best computer hardware on the market.