Bill Jordan pointed out the differences between the Colt and the S&W in No Second Place Winner. Although he had both brands, he preferred the S&W action as it was consistent with a straight-through pull in DA mode, as opposed to the staging* that could be done with the Colt action. Some like staging, but Jordan and most others, including Jeff Cooper, recommended against it for speed shooting.
*For those who came in late, staging is where you run the action hard and fast, stopping the pull at a natural place, a sort of little "hitch" present in the Colt and Ruger actions, which is not present, or at least not nearly as apparent in the S&W action, then precisely squeezing the trigger for the final let-off. CAUTION: S&W specifically warns against staging (stopping short or short-stroking) in the owner's manuals supplied as it is DANGEROUS. In the S&W action, which does not seem to have whatever little "hitch" that is present in the Colt I Frame action or the Ruger action, it is VERY likely that you will overshoot, resulting in an unplanned discharge, or you will overshoot just enough to lock up the action, preventing a continuation of that shot without a complete release and re-start of the action. Staging is a bad idea for any make of revolver, but it is at least a bit more forgiving in the Colt and Ruger actions. DO NOT DO IT with any brand. Staging is not now, and never has been appropriate in a defense scenario. It is a range technique in the same way shooting to reset is a range technique. KEEP YOUR FINGER OFF THE TRIGGER UNLESS YOU ARE GOING TO SHOOT. IF YOU ARE GOING TO SHOOT, DO SO IN ONE CONTINUOUS MOTION.