>>3272947note that 645 is the same aspect ratio as standard 35 mm. I would say use the RZ67 because the 6X7 frame is GOAT while 645 is just kinda "normal" to me.
You can develop 120 film in most standard canisters, so if you get into black and white films, you can develop your medium format for very cheap with rodinal (less than a quarter per roll). Learn by stand developing and then move into different concentrations and agitations to learn what you like best.
Pic is self-developed fp4+ and a shitty home scan