Easy. The good ole Model 10. The direct decendant of the earlier, non-numbered "hand ejector" models. The 10 is easily one of the best revolvers ever made by S & W. The triggers are usually excellent, right out of the box... reliability is unsurpassed... the all-steel K-frame will stand up to decades of use....the ergonomics are as good as any revolver ever produced, etc., etc., etc. The 10 was the STANDARD among police depts for many decades. Those that used other models, but still S & W's, invariably used some very similar variation(s) of the K-frame, internally identical to the model 10, such as the FBI model 13's and model 64's....which (by design) were simply Model 10's altered to handle the .357 magnum cartridge.
My 1984 vintage 10-8 (3" HB, round butt - identical in configuration to the standard FBI model 13's of the period except for the cartridge ) is the most accurate hand gun I've ever owned - and will put 6 rounds through the same hole every time - if I could shoot that well. (I've done just that several times, by carefully shooting in SA, from a rested position. Those groups averaged 5/8 ths of an inch at 10 yards.). I've gotten groups just over an inch at 50 feet, by the same means. (A better shooter than I undoubtedly could beat that.)
The only things that ever "let down" the model 10 was lack of adjustable sights (which could be had on other, more expensive models, such as the M19)....and the finish quality, which was kept basic for the reason that the M10 was intended as a service pistol. Ignoring those two items, the Model 10 was as good, functionally speaking, as any other K-frame model.