In the US where handgun hunting is legal in many areas, folks prefer the ruger because its built like a tank and is supposed to handle the hottest loads. (Something to do with no shoulders in the design, one piece forged...someone correct my terminology if I'm incorrect)
The S&W is apparently a more "finely" put together handgun, meaning tighter tolerances, smoother trigger, and will hold its value better upon resale.
As with all handgun purchases, go to your LGS, hold both the guns and see which one fits better in your hand.
And, on a completely subjective side-note, for some reason the Ruger just looks better to my eye...