Hello Senor Bear,
Well in trying to give an educated opinion regarding your question of .38spl or .357, I need to know the purpose of the weapon.
A snubbie is NOT going to be used for target.
If it is a backup to a primary weapon for LE use, another series of considerations are needed. If it is just a drop in the pocket to go to the store thing, yet another few thoughts are in play.
For a backup to a primary weapon, a small S&W j-frame or an old Colt Dick Special in .38spl, even without any sights, tape wrapped or rubber grips, seated girl decals or overhead floormats or airhorns and lasers are just fine.
If it is your only shooter you may want a little more flex in your choice.
The right tool for the right job, says I.
If you just want to bang away, a .357 may be fine for it's ability to digest a wider selection of ammo.
The suggestion of the 9mm, is a fine idea, IF it meets the specific needs of your weapons requirement

.
Words to live by:
"If someone tells you he is going to kill you,...believe him."