Well, I know that if I clear a Fuji FP-100C or B negative and want to scan it, I certainly can't use a transmissive scanner that only takes 120 or 35mm. For this reason, I think the cheapest thing I could get is an Epson V700.
So from the perspective of buying scanners for the negatives, it might as well be large format. Only exception might be if you use a polaroid back for a hasselblad or something, then clear the negative and trim it. Then it's 6x6cm 120 format.