I decided on the M&P 340. The lighter weight is a real plus for me in a pocket revolver. I found the grip of the 340 smaller and less of a problem for me with pocket carry (I did try each in my pocket before deciding). Both are light weight and will be handguns one will most likely practice with using .38, or .38+P. Ruger is a fine handgun, and I have a .22 Super Single Six. I have found I prefer S&W and have two .357 magnum revolvers and two .44 magnum revolvers. Different strokes for different folks.
When the number of people in institutions reaches 51%, we change sides.