Have you ever seen a Ruger revolver win an action shooting competition? Maybe, but it's not very common. Smiths rule the roost during a season of matches requiring shooting thousands of rounds. Why? Their triggers are easier to tune, their accuracy is good, and competitors prefer them.
Overall, I've had better results with SWs although the sample size is small.
I have 2 Smith and Wesson 625s, a 625-3 stainless that I bought used and shot in USPSA competition so much that the hammer nose bushing needed replacement. After the second trip back to the factory (after 15,000 + rounds), they gave me a new frame. It still shoots well although the notches in the cylinder are peened and it started skipping chambers. Off to the gunsmith to fit a new cylinder and a 4" barrel to be my IDPA revolver.
My other Smith is a 625-8 stainless with MIM parts. After a few thousand rounds I sent it to Mike Carmoney who bobbed the hammer, did a slick action job (despite the dreaded MIM parts), and installed a titanium cylinder. It runs flawlessly. I put in a Wolfe Gunsprings lighter weight mainspring and it lights off my reloads with Federal primers without problems. I have only 5,000 or so rounds through it but haven't taken the sideplate off it in the past 2 years.
The stainless finishes on both 625s have been very good. Unlike others, I don't flyspeck the finishes on my guns.
I have a GP-100 6" heavy barrel. From the factory, the cylinder throats were three different sizes (.3575, .357, and .358) A machinist fixed that problem but it was hard to improve the trigger for USPSA competition purposes. I spent a season shooting major with .357 magnum loads and then bought my first 625. A friend who claimed to be familiar with Rugers tried to do an action job but the gun kept "pushing off", e.g. the hammer dropped with the slightest pressure on it. It will go back to Ruger soon to put on a 4" barrel and put the lockwork back to factory original. It will become my IDPA Stock Service Revolver.
I have a SW 638 Airweight and a Ruger LCR in .38 spl. The Ruger has better sights and a better trigger from the factory. The SW has better grips and a better trigger after installing the Apex Tactical Spring kit. The LCR has a weird trigger reset that can cause it to skip a chamber or lock up. I prefer the SW 638.
So what does this mean? I would be interested to know whether the SW 629 or the Ruger Rehawk or Super Redhawk are more popular in Revolver silhouette competition that requires distance shots with heavy .44 mag loads. I would think the strength and reliability of the large framed Rugers would give them an edge in that arena but I don't know.
Next purchases? A Ruger Six (Security Six, Speed Six) in 9mm, hopefully with a 4" barrel. A SW K frame with a 4" barrel.
For me, Ruger = good and SW = very good. And, as always, YMMV.
Chris