The distance between performance of Broadsword and Predatory blade is still huge, because Predatory blade in empiric test deals with a full light combo 125% of the damage the Broadsword deals with a full heavy combo.
EDIT: Honestly Iām happy hearing that @Hugo 
this is the hardest weapon to craft requiring to be crafted in the Ymir forge and not at your home, it should be the best of craftable 1h sword