Am not sure exactly what you are asking there --- the stock systems will not fit everyone perfectly due to us all having variations in shape/size of our heads -- you just happen to have a head shape which is very close to that of a stock system,so it fits you well. For most people, a template made to the shape of their particular head is the best way to ensure a really good fit.The materials are the same [SFS] on each system, as is the hair quality. You have more choice in what you want to wear, by ordering custom --it is made to your specifications exactly. I hope that clarifies it for you. Paul.