I vote Snub .38...
...in my case, S&W 642.
I personally believe that a snub revolver is not as obtrusive as a mini-9 or .380 in a pocket, 'cuz the autos all seem to have sharp corners, straight lines and square angles that, to me at least, scream, "GUN!!!" By contrast, a snub .38, especially in a pocket holster, looks like a non-descript lump, which doesn't seem to be as obviously gun-shaped because of its round, curvy shape.
Also, I have trouble getting semi-autos out of my pocket, because those corners always seem to snag on the way out - grip tang, magazine floorplate, rear sight, hammer spur, slide stop, magazine release, they all seem to hang-up at one point or another. Whereas a small wheelgun just slides out effortlessly for me, each and every time.
That said, I'm still saving my box-tops for the new Kel-Tec P3AT!