I can't say what's "best" but I can say that mine, a 686-6 6" is fantastic. I'm no bullseye shooter and with a lot of handguns my accuracy beyond 15 yards is pretty iffy. However, last week, I took my 686 to the range. At 25 yards, shooting offhand, double action, I put five in the 10 ring plus one in the nine, for a 2 1/2 inch group. I followed that up by putting 18 consecutive rounds within the 10 ring at 10 yards with the group at about 1 1/2". I do not believe that it is possible for me to improve on that degree of accuracy. So I say, again, my 686-6, with its MIM parts, and yes, its lock, is a simply fantastic handgun.