I carry a couple of the cameras you mentioned, namely the Retina (in my case a IIIc), and a Leica IIF with a collapsible Summicron. The Leica II (or other Barnack cameras on my shelf) has always been my pocket camera, it is smooth, quiet, and the old lanthanum glass gives the photos a nice character. I recently picked up the Retina as it was being sold as a non-working parts camera. It took me 2 or 3 minutes to fix it, and I spent a day shooting it. I was amazed at the results, easily the best camera I have ever bought for the price. I have never tried a Rollei, so I can't offer an opinion on it.