The Ruger's grip is changeable. It's even modifiable, with careful file and sandpaper work.
The S&W snubbies can be had with tiny wood grips, uncomfortable without a Tyler grip adapter (see: http://www.t-grips.com/), or with smallish Pachmayer-like rubber ones that also can be reshaped or otherwise modified.
There's lots of custom-made grips out there for the S&Ws, but not any yet for the Ruger. Look, for instance, at: http://www.collinscraftgrips.com/index.php