The new S&W branded stocks (grips) sold by Smith & Wesson look good and they handle decent enough, even when firing heavy loads. For shooting and for concealed carry, they are quite all right.
The problem is (IMHO) with the thumb-rest area; it is a gradual contour that (IMHO) does not go deep enough soon enough. The scuff marks are from the Safariland loader.
The thumb-rest area on the Uncle Mike's stocks (grips) once sold by Smith & Wesson (IIRC, for over a couple of decades) looks to be thinner, flatter, and more defined.
The Safariland loader aligned wonderfully with the old Uncle Mike's stocks (grips).
The loader alignment is not so pretty good with the newer stocks (grips)