Looking at the compressor maps of the two, the GT28 is around a 35 lb/min turbo. Maybe 40 if you run it all the way out to the very edge of the compressor map. At that same pressure ratio, the GT35 is moving almost 70 lb/min of air. At lower pressure ratios, they look similar, but I don't know why you would buy a GT35 and not run higher boost.
Did you ever own a Supra? Those are the only guys who I've heard use the words "small" and "GT35" in the same sentence.
