38s have it all over the 357s
357 mags are best out of a K or L frame. Of course they can be fired from a snub, but not well. ALL the vids you see on youtube of dudes firing 357s from an Airweight or even a steel J like mine (649) are usually in single action and fired very, very, slowly, cautiously, and the recoil is severe. Few people can maintain a two handed grip since the recoil kicks it out of the support hand almost every time; good luck trying to get a follow up shot in a real situation! Say you were injured and had to switch to your off-hand, the J would be virtually uncontrollable. 38+ is the more logical round.