I voted for the Service Six, but only because the Speed Six was not an option. I really like S&W revolvers, and had a very tough time with this poll, as the K-frames and L-frames are also great choices, especially in stainless. But I have a 4-inch stainless Speed Six that is a treasure, and thus my vote for its square-butted brother, the Police Service Six. I do prefer rounded backstraps on a revolver, regardless of make.