Although I like the Colt New Service, it doesn't lend itself to double action shooting as well as the Smith-N frame, for me specifically. The reach from grip to the trigger is longer than the S&W and the Smith double action is better IMHO. Now I'll venture in to unkown waters but I think the early Colt 1917's had the cylinder bored straight through; no shoulder as in the S&W, and this allowed the S&W to fire the rimless cartridge without the 3 round steel spring clip, while the Colt would be a maybe thing. As both 1917's were made to be fighting handguns I give the nod to the S&W because of the better barrel control due to its smoother double action. That said the New Service was a robust and accurate revolver but most of my shooting with the Colt NS was single action and it shined in that format. . .Good question George.