If I get a revolver, I will get 357. You can't beat the dual-caliber capability.
Once upon a time S&W made one of the lightweight centennials that was very, very light, but not rated for even .38 +P - the gun would handle it but it voided the warranty (and, presumabably if you shot a lot - and who shoots a lightweight snubby "a lot"?, you would eventually spring the frame). I thought it was the original 442, but maybe it was an early Scandium of another model.
IF I intended on carrying only standard pressure .38 special, and a revolver came in with an ounce or two weight savings off the an equivalent .357 magnum - under those exceptionally limited circumstances, I might choose a .38 special - but, that's really 15 to 20 year old thinking. With the options now, the 640, M&P 340, Ruger LCR, to name a few, you can go .357 in a package that is still very light and carryable.
This post was edited on 2/7 at 10:50 am