I will also say I like the gp100 more than the 686...
I bought a used S&W Model 15 a few years ago, and that started me on a S&W kick. Eventually, I got a 4" 686.
However, in comparison to the Model 15, it just didn't thrill me...and finally sold it.
But, I still wanted a 357mag in the collection.
I ended up finding a good deal on a 3" fixed sight GP100. This is a revolver I really like. The trigger is fantastic on mine...easily the equal of my well used Model 15, and better than the 686 I owned previously. I think that Ruger has improved the trigger on late model GP's.
I can't seem to miss with the GP, and shoot plates at my club...hitting the 10" plate at 80yds is easy.