Pictures are deceiving sometimes.

The Colt E&I frame was heavier and slightly larger than the S&W, especially in key areas.
What the picture doesn't show is that the Colt cylinder is significantly larger in diameter than the S&W "K" frame.

Smith triggers and Colt triggers have a totally different feel, with the Colt stacking as its pulled.
People who grew up on Colt's like it, people used to S&W may not.
The S&W trigger is not "smoother" then the Colt, smoothness has nothing to do with stacking.
Again, different strokes (trigger) for different folks.