Peter is right. Unless you make very large prints, or need to scan very dense negatives, the skill applied in digital editing of the scan is more important than actual differences in the scans of any of these three scanners. In fact, digital editing would still be the most important factor, IMO, even if we were to include a scan from drum scanner.
And there is one more factor, and that is the fact that the negative itself is often the weak link in the comparison. Most negatives of 4X5" in size or larger will have no more than about 2000-2400 dpi of effective resolution/detail. Even an Epson V700, if used correctly, will come very close to pulling out that much detail.
Medium format negatives, especially those made with high grade optics like Mamiya 6 or 7, are capable of much more resolution (and they are enlarged more) so one would probably see a difference between a scan with a Nikon LS-9000, which IMO will not give more than about 3500 spi, and a scan with an IQ3, which is capable of more than 5000 spi. But, even in this case the superiority of the IQ3 would probably not be evident except in very large prints.
Sandy King
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