This is intriguing. I wonder if we will get a definitive answer. As far as preference between 5W and 3W I’ve always preferred the 5W as I think 5he side proportions are more balanced.
^^^ Little off what post is about , 32 3w & 5w's look proportion correct to scale non chop, if you have seen both body's that have a A Chop top , Channeled & Section , low rake With or with out fender's look more proportional to size then just a Chop top.(especially 3w) , also Channel & Section roadster / Truck or roadster just Section.
Three windows are more popular because the doors are wider and people are too big (fat) to comfortably get into 5 window coupes. But I always like the aesthetics of the 5 window more.