I own both with 6"bbl. The Ruger is stainless, the S&W is blued. I fire both a lot. I use reloads of 173gr.LSWC in both. So far after maybe 10yrs.(?). no cracks or end shake in the Mdl.19, just as tight as the day I bought it. I know it was not made for a steady diet of .357 Mag., but my thinking is if you have a .357 Mag. you use .357 Mag. in it.
With that said the Ruger Security-Six seems to be the better of the 2.
With that said the Ruger Security-Six seems to be the better of the 2.