Having gone through 3 regular 629's and 2 Ruger Redhawks, and having originally been biased toward the Ruger ... I'd have to agree with Lonegunman on this.
If I could sell my current Redhawk, I'd buy a Smith to replace it, for several reasons.
1. Redhawks are not as durable in some ways. The Redhawk, while able to stand higher pressures, has an action dependent on some pretty cheap castings. Once you break the el-cheapo little 10 cent casting they call a "transfer bar", all the pressure-strength in the world won't make your wheelgun run. I broke a Redhawk and a Blackhawk this same way. I have never had this happen with a Smith and Wesson, but then I never had to dry-fire them as much since they had nicer triggers. Take this FWIW.
2. Smith usually won't leave razor-sharp edges on a gun leaving the factory. Finish is usually superior. I've never got a Smith that has inappropriately rounded or "bulged" flats like on my new Redhawk. It looks like its been in a frame vise.
3. Ruger puts out a high number of lemons these days. I'm on my second Redhawk, the first having been returned due to a locke-up action.
4. Typically better trigger (SA) on Smith, meaning less practice and dry-fire necessary to master and maintain basic marksmanship skills.
5. Accuracy - I would say Ruger here, but after shooting a few of their later .45 Colt offerings, they don't seem to know how to ream a cylinder throat correctly anymore. My .451" bullets have a hard time going through those .449" holes; hence, my .45's won't shoot worth a darn. I could buy the cylinder reamer from Brownells, but I think I'm just gonna sell 'em and get a Smith and be done with it.
YMMV, as this may not carry over to the .44 mag. guns. I personally wouldn't chance it though.
In short, the Rugers of today are not quite the gun they were years ago when they earned their reputation. The new management isn't nearly as attentive to QC, IMHO.