For carry in a pocket, the best IMO are the various Airweight and lighter (AirLite Ti & Scandium "SC") S&W concealed hammer revolvers. While I have and constantly carry a 340PD, I cannot say that these guns are really worth the cost, which is substantially higher than that of the Airweights like the excellent 642 / 442 series pistols. There is, in fact, a ".38 S&W" cartridge which was derveloped years before the much more popular .38 Special, but no one that I know of chambers new guns for the .38 S&W anymore. (No, you cannot use the shorter, less powerful S&W in the Special chamber...too wide to fit)
I would go for the S&W 642...the factory is having a sale of some kind on them now as well and advertising that fact in many of the gun rags...$399 I believe. Load it with either a 158gr SWCLHP+P like the WW # X38SPD (note that this is an all lead bullet) or if you can find any, the very newest CCI 135gr. +P Gold Dot load...they may not even have it cataloged yet, but it is an excellent round. You won't need a magnum in a light pocket gun, the +P HPs will do just fine if you do your part. They are mostly for "close combat in a phone booth" situations anyway, and for me, are mostly used as a second gun...but I have, due to circumstances, carried only the little revolver at times.
The Ruger 101 is an extremely tough handgun, but it is neither small nor light enough for MY pockets...don't know about yours. I have heard many good things about the Taurus guns as well as some bad. My thoughts are that if it looks like and shoots like an S&W for only a few dollars less, then I will spend the extra $$$ and get the real thing since it is MY life on the line!