I think that the purpose of those two products is different. Speed Shine is more like a dedicated QD, while S&W is a wash alternative that can be diluted to a QD.
Agree with ZaneO. Speed Shine is the equivalent of Quick Shine, Final Inspection, etc. Spray and Wipe is mainly used as a waterless wash. Although I have used a 50/50 mixture of QS and SW for QDing.