All 1" forks, and posibly frames are weak, just some are less weak. All the early (2 stuck together) S&M dropouts bent (but they lasted longer than any of the single dropouts on other frames).
Are you are asking which early S&M frame is the best to ride, or the hardest to get hold of, or the nicest to look at, or the most iconic, or ... or ... or ... ?
(Im not trying to "gogo" you and make fun, its just a pretty open question you are asking) 
Thanks Alex

Yeah my question is open , I suppose to ask which is everybody's personal favorite , for your own reason why

but also I hoped to find out which frames were a popular favorite for racing

Going off the poll results , I've already rode the 2 most popular , and I liked the geometry on both
Thanks for all the reply's ,votes and opinions

It was worthwhile , to me