It's interesting that you've narrowed your choices down to two quite dissimilar cameras.

Do you want autofocus or manual focus? Do you want a modern feature-laden camera or something simpler? Do you want to be limited to Contax G series lenses or would you prefer to have your choice of the many M mount lenses out there (and the many many screw-mount lenses that you could use with an adaptor)? Of the two, I'd be inclined to go with the Bessa, but I don't know what your preferences are.