As a former owner of nearly all of those cameras, I would hands down say Mamiya Press system. In terms of handheld shooting, it puts the Crown to shame and the lenses are easy to focus, tack sharp, and best of all, fun to use. The 127mm is a great, great lens, so is the 100mm (both 3.5 and 2.8) and even the humble 90mm is surprising. if you can find the 50mm, my god is it good. The grip with cable release is easily had and makes the camera very easy to tote about.
Shooting polaroids is a blast with it and I'd set mine up with a 6x9 and 6x7 back on camping trips which produced some of my best images.