>>3004405My opinion is that the optical quality between the lenses of those two systems doesn't justify the massive price difference between them. My 3 lens, 5 back, Bronica SQ-A system cost me less than $800 in total...and that's counting spending $120 on a stupid wlf (those and the 35mm film backs are the only 2 'expensive' parts of the system).
I've made beautiful 20x20 prints from my Bronica. Unless you're planning to bring BIG I doubt any optical difference between the two would be noticeable. If you're a bokehfag I think Hasselblad lenses have a 'creamier' look though.
I bought my Bronica when I was 15 and went with it instead of a Hasselblad because I realized for the price of a second Hasselblad lens I could get 2-3 more Bronica lenses and some extra film backs.