Quality?
Hard to say.
Fit and finish? S&W. Even today.
Trigger? Ruger DAs have come a long way from their darkest lawyer-driven days. The old ones weren't bad, either. In between, they sucked.
Desirability? I own zero Ruger DAs because they make zero DA revolvers that I have wanted, when it came down to spending the money. They're bulkier and heavier than equivalent Smiths. See other posts for discussions of whether bulky and heavy necessarily translates into stronger.
A 7.5" Super Redhawk has its merits, should I go bigger than .44 Magnum, but otherwise, when I have compared guns to purchase for carry and real-world use, the Smith in any given niche has always been a better fit for what I have wanted. The .357 LCR might appeal to me, too, if I want a relatively cheap lightweight .357, but I have that niche bracketed already by a lighter .38+P and a steel .357.
I have SA Rugers. THOSE things are solid, and all my magnum handload testing happens in those. They're fun range guns, and my long-barrel SBH has serious hunting potential, too. The fit and finish aren't the best, but they're adequate for what the guns offer and what they cost. The triggers plain suck. I'll have to have them 'smithed at some point, but I keep forgetting to do it until I shoot the guns the next time.