User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4421067-20111211195832/@comment-173.179.100.126-20111211201211

This is just a wild guess, but there will most likely be a difference in terms of base power/element difference, with weapons from one species having a higher element, but less base power, than the other. Though it could be anything, including sharpness value or duration of sharpness, affinity or even slots.