I feel I am fortunate to own both S&W and Ruger revolvers, maybe it's 'cause I'm old.
A friend stopped by with his GP 100, i've never shot such an out of the box accurate revolver. I still wonder where the steel grips went. My Security Six had full grips under the wood; my Redhawk has full grips under the wood. That said, there is no question , "Where's the beef?" It feels as if it will still shoot after a ton of abuse.
The 686 is beautiful, it too is accurate, it can be worked to unbelievable smoothness. I like it enough to have purchased a second.
Which ever you choose , I don't believe you will make a mistake!