I think it might also come down to portability vs. flexibility. The Hasselblad will offer more flexibility, while the Rolleiflex will offer portability. The 2.8 Rolleiflex is not a lightweight camera, but you also don't have the isssue of backs and lenses.

And I agree with others who say to try both the Hasselblad, if you can, because you'll know rather quickly if it "feels right" in your hands.

My personal thoughts are that while I love a TLR, there's nothing like an interchangeable lens system. I have the big Rolleiflex SL 66.