The K-frames make great range guns and adequate (with at least a 4 inch barrel) defense guns. I think that S&W got the grip just right in size and putting a pair of HOGUE rubber grips makes it a perfect fit for me. I do not own a .357 K-frame, but was issued a 3 inch barreled, model 13 many years ago. Great to carry, not so good to shoot. Also, the quality control of our guns was spotty.
I picked up a battered, but otherwise tight model 15 about 3 years ago and it became a favorite range gun. I shoot either the 130 Air Force load or WINCHESTER Defend 130 grain load plus qualify with the REMINGTON 125 grain +P sjhp which I use as a defense load. It is quite pleasant to shoot and should do the job.
Skip the 2 inch models for defense. The barrel is just too short and the velocity too low for me to choose it over something else this size (K frame). I like the Security and Service SIX with 110 grain .357 magnum loads in this size gun with a 4 inch barrel. Like I said, I do not like snub barrels.
I also have owned and shot a 9m.m. S&W 547 and became disenchanted with it. It shot very well, more accurately than any .38 I have show, but did not hold up as well.
I will pass on a K-frame .357 magnum. I have shot at least 3 different guns and was not satisfied with any of them. I eventually purchased a S&W 681 (L frame) as a carry gun till I could switch to a GLOCK.
Jim