One thing I've found on my SP101 is a full grip (hogue monogrip in this case) is desirable with heavy .357 loads. My M85 hides better, is pocketable, the SP101 isn't, the grip profile is larger, the gun is 27 ounces vs 17. I really think .38 +P is plenty for self defense, but yeah, I like .357 power. For me, it's just a matter of carry mode. If I carry IWB, might as well go with .357. For a pocket, only the little M85UL will do. I don't have a 605, but I'd expect I'd want a bigger grip on it, too.
I shoot about as well with my Taurus 85UL as my Ruger. The Ruger's trigger is VERY smooth, but the Taurus's trigger is very smooth and lighter, one of the slickest out of the box triggers I've ever used, pretty amazing. I'd expect the 605 to be good in this regard. I bought a Wilson spring kit for the Ruger and will address this malady (if you can call it that). Really, as smooth as the trigger is, the weight of it doesn't bother me. The little Ruger shoots very well.