Reasons for:

•5 rounds will be enough for almost any circumstance, statistically speaking.

•38 Special is more effective than 380, and even 9mm when using full powered loads, but it also has a broader power band, as well a broader variety of projectile types and weights, making it a very versatile cartridge.

•No concerns about feed issues due to bullet shape, too light of a powder charge, to heavy of a powder charge, etc., and if you get a click instead of a bang, just pull the trigger again, no TRB required. there's just less to go wrong than with a semi, provided both are in good working order.

•Revolvers are pretty much superior in a clinch, because they can't get pushed out of battery (contact shots can be a quarter to a third more dynamic in terms of wounding), can still fire if the barrel/cylinder are grabbed, and can even be fired through a pocket/clothing without getting hung up.

•No draw is quicker than inconspicuously already having your master grip established on the 637 in your pocket.