If you can't lay your hands on the S&W's but you can on the Rugers, buy the Ruger's. I have owned both thru the years, got a nearly new Mini 14 and a 10-22 in the gun safe along with my K22 and my 325PD. All four great weapons, just depends on what you like. As for my little SP101 6 cylinder .22LR being a "pig" I strongly disagree. Built like a tank and I never shot any of my DA revolvers in anything but single action mode. So it is not as accurate as my K22 but plenty accurate for what it was built for. I love S&W's but I love Ruger too.
Reb
I wouldn't buy a revolver without trying it first. I would want to check how tight the lockup is, cylinder clearance and the trigger. I have owned Smiths and Rugers. Both are good guns, but I won't buy a car without a test drive.
I have seen very different triggers from 2 samples of the same gun. Personally, I would rather buy new.
I put 10,000 rounds through a 6" model 19 years ago, with only 1000 of them magnums. By then, the gun was spitting and was a flame thrower. The barrel/cylinder gap was over spec. I don't know if a Ruger will last any longer than a 686, but they are good guns.