I bought a 637, then a 642 (ignoring the SP-101 that I owned and carried for a bit), realized not only did I stink with a snub, but with a DA revolver in general. Bought an LCR .22. Now wish I had an LCR in .38. Did help me shoot the 642 better, though. Still love it. Wifey took over the 637. Coming back to the SP-101, NEVER carried .357 in it. Lack the forearms of a lumberjack (and that's OK), so stuck with .38 +p. Rambling aside, the standard, and correct, answer is, shoot some, find out what you like best. Not too helpful, I know, but what in life is.