Are you looking at a gt4202r? Some of the a/r's you list are off so am unsure what you are comparing but the 4202 uses the 74.5 inducer.
If it is a 4202, it is a 95lbs/min charger which is a little less air, by several lbs/min than the s475, but spools a great deal faster and from a lower rpm level. I'd suggest the 1.15 A/R as a primary. It'll support right about 700. What is nice about them is they are always ahead on the curve and not trying to catch up like laggier turbos.