If we talk self defence in the senerio of one's own home, or in defence of life and property in the US in a domestic context you will find 38 special a good choice, there is a variety of good ammunition, low recoil and furthermore you enjoy shooting the revolver, if you enjoy shooting it, it follows that you will practice more. Once your basics are established you then can more toward the odd practice session with 357.
You can do enough 'damage' trust me with a 38 special in order to defend yourself, the arguement and myth of 'stopping power' will rage on. But there are other factors just as important, training, accurancy and confidence. You have made a good choice...............