I haven't made direct comparisons between current models of the Bronica and Hasselblad, but I did own the first model of the Bronica way back when. What a clunker. But, my impression is that more recent models have closed the gap considerably. I still believe the Hasselblad is the superior system, however. Whether that's worth the premium is up to each individual.

As to the 200 vs. 500 series question, I think it depends largely on what and how you shoot. There are advantages and disadvantages both ways. Personally, I lean toward the 500s because of the additional flexibility of in-lens leaf shutters, and the history/manufacturing experience behind that model.