The Smith is a much more refined piece of work, better trigger, smoother action, better balance, better looking, and a much higher resale. S&W has superior options available in the 686 for ccw, 2.5', 3', or 4' barrels. The S&W has far more accessories available for it, particularly grips and holsters.
The Ruger is a nice DA revolver, it's sturdy and accurate, but it also has a stiff trigger, it's also thin(width)compared to the S&W, and heavy, it can detract from accuracy unless smoothed out. There are not many decent aftermarket grip options for the GP100, it's an awkward revolver with many of them, particularly for ccw....
To my mind this is a no-brainer, the Ruger is much more in line with the offerings from Taurus then S&W, I'd take the 686 over the GP100 everytime, pre-lock or not....