That's really hard to generalize about, when guns have been made for over a century, using different materials, for different purposes, etc.
However, I'll be stupid and try...
My K-frame is VERY smooth in DA mode, light and crisp in SA. It's a regular old Model 10, but a relatively old one (10-5).
My recent-production J-frame (DAO), bone stock, feels a lot better than I expected it to feel, but there's more of a "mechanical" feel to the pull. I have read that this is an artifact of the smaller internals and shorter lever arms that entails. It's good enough for me to keep 'em in a pie plate at 25 yards, DA, with stock sights, in poor light. Not bad, and totally adequate -- feels at least as good as DA in some full-size Colts I could mention. However, it doesn't feel buttery like the 10 does.