I've owned both a Ruger 44 Redhawk and a S&W Model 29. The trigger on the Smith is superior to the Ruger. However, if you want to shoot heavy loads on a regular basis - Ruger. The Model 29 I had was sent back to Smith twice to be fixed from shooting maximum loads in it - which is why I bought the Redhawk. I also agree that the Redhawk give less felt recoil.
You can't go wrong with either of them - just evaluate how you're going to use the gun, and pick the one that fits your usage.