The Colt Python has the smoothest action I have ever felt. That being said.... I would go for the GP100.... I have owned dozens of Rugers and everyone has been accurate and fairly smooth from the factory. A little tuning will make them even better.When it comes to double action revolvers, does it really get any better than a Smith?? Now single action, Ruger and even Colt are better IMO. Since we are talking x2 I would say the 686.