get a 686....built like a tank....i have a police positive special too
Of the two choices at hand I would go with the Smith. Nothing wrong with the Colt but because they've become somewhat collectors items, they are pricey. Personally, I would suggest holding out for a 686 with 4" barrel- that length will give you what you want at the range without being too cumbersome to carry. The frame is larger yet the grip is nearly identical to the k-frame 19/66.
There's really no bad choice here.