Yes it IS a Smith site but...my choice would still be the 66. Extra round. Nuff said on that topic perhaps. While not critical in woods walk abouts, could truly save your life in ccw settings. And the 66 is MORE than "doable" with proper leather selection, either OWB or IWB. I know, I carried one in a variety of lengths for years, daily.
Additionally, you can find SP's by the bucket load as a still in production item, not so the 66. I think the point about .357's in K frames is somewhat overblown in that reported problems were only with 125 grain flamethrowers and the .357 magnum has a HUGE variety of loadings available should you require magnum velocities. For small game potting, plinking, snake elimination, etc. a good .38 special will be the most shot round and I can't remember any issue with any K over .38's.
Finally, I agree with the previous poster about Rugers and their triggers. The prime reason I've never gravitated toward this brand in DA revolvers is their factory triggers. But I've owned a gazillion Smith K's over the years that had outstanding triggers (and sights) right out of the box. Those two factors are THE issue with accuracy imo.
In short, of course it's your bucks, your waist (or shoulder, or small of back, or fanny pack, or whatever) and pick the one that most suits YOU. But me? It's the 66, easy choice.