I own more Smith & Wesson revolvers than I do any thing make and type. However, I bought all of them used so I haven't given a penny to S&W.
I've got a Sprinfield M1A, 1911 Loaded stainless, and a 1911 Mil-spec that were all purchased new so out of new purchases it would have to be Springfield. Ruger would be running in second place.