Difficult choice, I have Rolleiflex Automat, lovely camera, Rolleicord, lovely camera, but then I have various Folders, a good collection of 35mm's all classic cameras, including Leica IIIF, but for MF it would have to be my microcord 1 1/2, but I can't choose just 1 camera, i have a favorite 35mm camera, no, not the Leica, but a Voightlander Vitessa T,I have the full set of lenses for it and they knock shades of of the Leica lenses that I have, but the camera I like the best is the one I happen to chose to use at any one time,