I've owned a few of both over the years, currently only have a 686 4" if that tells you something. I wouldn't feel poorly armed if I had the Ruger instead though.
One caveat, all of mine have been 6 shot. I've fired the 7 shotters and just don't care for them... probably just bias, but I wouldn't recommend one.
Shoot both and get the one you do better with, flip a coin, or get the one you think looks best.
The criteria you mentioned... I'd say the individual unit you get will matter as much or more than whether it's a Smith or Ruger.
Truly a win-win situation and I think everyone should have a medium frame .357 in their battery.