The 686 will have a better out of the box fit and finish, and in all likelihood a better trigger pull.
The Ruger is more robust and simpler to tear down for deep cleaning, or modification. The triggers on both firearms, if new, will improve with use.
A Wolff spring kit in the Ruger takes 10 minutes to install, and greatly improves the pull. A couple hundred firings (or dry firings) smooths out the trigger/sear engagement and gives it the final polishing it should have had at the factory.
If possible, compare them side by side, and get the one you like best.
