I've become fascinated by these cameras and wonder which would be best. I'm attracted to the RB as it is all metal, not plastic, and fully mechanical. That makes me think it would be more reliable, more easily repairable and less expensive, even if it is somewhat more primitive. The lenses are also less expensive. On the other hand, however, it would be nice to have all the more modern features of the RZ, even though the electronics might give up the ghost and become irreparable. So which would it be?