Howdy
You will have to write a justification for your character's choice, as there are many suitable models to choose from. My wife initially chose a model 640 ( J frame, internal hammer, .357 magnum, stainless steel round butt ) after having rented a light weight variant to "try before you buy", and was put off by the greatly increased recoil and muzzle blast. AFTER a bunch of range time ( AND carry time), she did see her way clear to getting a model 642 Airweight in .38 special, but +P rated. Yes, it bucks and barks, but then, factory .357 mag loads not specifically loaded for short barrel guns are to some great extent little better than +P .38s, with a huge muzzle flash and blast to boot, when fired from short guns.
Her prior 640? It matches my own, and shoots well for those who stay up on training. As with all "snubnoses", they are not a gun for the inexperienced nor casual, and require considerable range time to maintain skill with them. Add to that the limitations of 5 round capacity, and you have a tool for the experienced. We use all the same speedloaders between them, loaded with identical ammo, for carry. We also have the "advantage" of the "New York" reload, by taking up another gun of similar or identical handling characteristics, if it should come to that.
Just my 0.02