I've owned K, S, and N framed Smiths since the late 60's and have never had a problem with any of them...thousands of rounds through a K framed M-19 have failed to loosen it a bit...a '73 gun BTW...and it'll still do sub-2" gps at 25 yds...same with its bigger cousins.
Rugers, all of them, have always had a reputation for sheer strength...my experience has been limited to the single actions....and can attest to their accuracy.... it sometimes has to be seen to be believed.
As to trigger pulls, either double or single action, Smith has always had the reputation that all others compare to..."it's as good as a S&W"...that said, if you do get a Ruger with less than a sterling pull, it can be worked on easier than a case hardened Smith's trigger.
Guess you takes your choice and pays your money...Me? I'd go with a Smith, just 'cause I like their overall look better than the Ruger which seems a bit clunky to me. As to Smith's hated internal lock...I've got two which have not had a problem with several thousand rounds through them...for me, it's a non-issue.
One last thought..if you plan to carry concealed, you might consider one of the J-frame Smiths...good design, thin cylinder of 5 rounds capacity, and they all sport Smith's 2nd to none customer service policy....and I've had experience to back up that last statement...the pic below is of a 5" bbl'd J-frame M-60...a really good trail gun...light but still carries a wallop...
Best Regards, JMHO, Rod
M-60 with a 5 inch barrel...good trail gun...