Strength, durability, and reliability all go to the Ruger.
I hear this, or some variant of this, a lot. And, it may even be partially true, but...everytime I hear it, part of me asks "SO FREAKIN' WHAT?".....
Strength: is a "so what?" to me, because NOTHING I do, have done, or even remotely contemplate doing will approach the strength level of the guns. While it might be nice knowing that a S&W will blow up at X, and a Ruger will blow up at 2X it doesn't have any practical advantage for me.
Likewise durability. In any kind of normal use, even including competition, by the time you wear the gun out, you will have spent several times the cost of the gun in ammo. EVERYTHING wears out if you use it, and most of us won't ever come close to actually wearing out either gun from actual use.
Reliability: I don't bury my guns in the mud, or drag them through the desert behind a truck. Testing under extreme conditions really doesn't prove anything about operation under normal conditions. Show me a HISTORY of S&W failing and Ruger not failing under NORMAL conditions, THEN you have a valid claim, but not until then.
I really love many of the Ruger products. However, their DA revolvers never did much for me. I have a number of S&Ws, and Ruger Blackhawks/Vaqueros. Don't have any Ruger DA revolvers. Never much liked them, I prefer the S&W. (and I am not including current S&W with the lock and MIM parts, I don't like, or have, any of those, either).