Board Thread:Fleet's Prepared-ness/@comment-30371411-20170429181147/@comment-11700680-20170429210832

Kawakaze has the highest overall combat power between the two, while Hibiki has the highest survivability thanks to higher stats and being able to equip a medium bulge. Hibiki also has a higher ASW stat and is able to equip the Special Type 2 Amphibious Landing Craft, which Kawakaze can't.

So really it is up to you, Kawakaze is another night battle destroyer, and Hibiki is one of the few destroyers that can tank and can do OASW without needing a ring.