"K Frame Snub Superiority"
One shot. That was the difference between the K-frame snub and the J frame guns. With the same number of shots, many users preferred the Colt Detective Special or Cobra which was slimmer and lighter, even in the steel frame.
When it was a choice between the 5-shot I frame .38 S&W Terrier and the 6-shot M&P Snub in .38 Special, most folks went with the larger K frame - six shots and a more powerful cartridge.