Of the three listed, LCR. I will always prefer a spur-less hammer or concealed-hammer revolver for pocket carry.
My personal real-life choice, outside the boundaries of the poll: SP101 or S&W Centennial, depending upon the size of the pocket. Over time, I have accumulated enough garments with big pockets, so as to be able to carry the SP101 most of the time.
Edited to add: I answered your poll as posted, with LCR as a choice. Your original post, however, says LCP. I would not choose LCP. I was not the first to reply to the poll, so I do not think changing the poll is ethical, if that is possible, if it changes my vote.