I wear my Brannock size in Nylites (9.5) w/ loafer socks or sockless. I wear 9D in most dress shoes and 10 in most other sneakers. I don't have anything other than Nylites, though. Not sure how consistent they are between styles.
Quality is probably the same, the only thing that seems different is the sock liner. I like the off white of the PS better than all white CP's though. They seem to be on the same margom sole so they will be as sleek as trainers can be really.