I think the S&W/LCR choice is highly personal. I too had read about the "nicer" trigger on the Ruger, but when I shot one side by side with a 642 at a range I just liked the S&W better. I carried a Glock 26 at the time, was shooting semiautos almost exclusively for both fun and in competition, and was not even thinking of carrying a small revolver - I just happened to be at a rental range that had both of the little guns available and was curious to see what the differences were.
I was surprised that I liked the S&W better than the LCR, after all the hype in the press about how great the then-new Ruger was. I think it IS a nice little gun, but for ME, in MY hands, I preferred the S&W.
YMMV, as they say, so the only way for YOU and your wife to be sure is to shoot both side by side if you possibly can.