The things that swayed me in the Bronica direction were obviously cost, i bought a prism head, body, 80mm PS lens and a 120 film back for about £400 a good £200-300 less than a 500C/M, i could buy the 40mm lens with that extra money whereas a Zeiss one for the 'blad is about £600-700 alone. If you have the money to spend the Hasselblad is the better system i won't deny that. The big advantage i could see was the large range of accessories and bits for the Hasselblad as the company is still around and the old stuff is very popular keeping it in circulation.
I researched the Hasselblad (and every other MF SLR i could find) and while it's certainly the better camera you pay for it, and if you want anything other than the standard 80mm lens you'll be paying through the nose for it. PO Box, Afghanistan, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antigua and Barbuda, Argentina, Armenia, Aruba, Azerbaijan Republic, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, British Virgin Islands, Brunei Darussalam, Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Cape Verde Islands, Cayman Islands, Central African Republic, Chad, Chile, Colombia, Comoros, Congo, Democratic Republic of the, Congo, Republic of the, Cook Islands, Costa Rica, Croatia, Republic of, Czech Republic, Côte d'Ivoire (Ivory Coast), Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Ethiopia, Falkland Islands (Islas Malvinas), Fiji, French Guiana, French Polynesia, Gabon Republic, Gambia, Georgia, Ghana, Gibraltar, Greece, Greenland, Grenada, Guadeloupe, Guam, Guatemala, Guernsey, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Hungary, India, Indonesia, Iraq, Israel, Italy, Jamaica, Jersey, Jordan, Kazakhstan, Kenya, Kiribati, Korea, South, Kuwait, Kyrgyzstan, Laos, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Macedonia, Madagascar, Malawi, Maldives, Mali, Malta, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Mexico, Micronesia, Moldova, Monaco, Mongolia, Montenegro, Montserrat, Morocco, Mozambique, Namibia, Nauru, Nepal, Netherlands Antilles, New Caledonia, Nicaragua, Niger, Nigeria, Niue, Oman, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Portugal, Puerto Rico, Qatar, Reunion, Romania, Russian Federation, Rwanda, Saint Helena, Saint Kitts-Nevis, Saint Lucia, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, San Marino, Senegal, Serbia, Seychelles, Sierra Leone, Slovak, Slovenia, Solomon Islands, Somalia, South Africa, Sri Lanka, Suriname, Svalbard and Jan Mayen, Swaziland, Sweden, Switzerland, Taiwan, Tajikistan, Tanzania, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Turks and Caicos Islands, Tuvalu, Uganda, Ukraine, Uruguay, Uzbekistan, Vanuatu, Vatican City State, Venezuela, Vietnam, Virgin Islands (U.S.I've bought a Bronica SQ-Ai myself this week so i'm slightly biased in that direction.