This is a dilemna only you can answer. You're on a an island isolated by the South Pacific. Many people cannot relate as to suggest a choice, by reason of availability to you. Either choice is a good one. The Hasselblad is compact, but also invariably needs service to see that the shutter is still accurate, and the mirror pads are replaced. The 67 is a FP shutter, which seems to hold accuracy better than BTL shutters (IMO). Further, a bigger negative from a lesser lens-quality camera is still sharper that the very best lens on a smaller negative. But with the tripod, you answered your own question. If you are one of those married to a tripod, then why not use the biggest camera you can carry? Otherwise, the Hasselblad can give superb performance without all the heavy iron to lug around.
As for me I carry a 553 ELX. But for one reason--mirror slap. The weight of the motorized Hasselblads makes an excellent vibration damper. Plus, they are cheap (here in the US). Mine was a choice that makes itself.