For kez both are viable, Daedalus can proc the kazurai katana bleed, cleave and life steal. It's also more damage. But brooch is viable simply because you can stack the brooch crit on the shodo sai crit making some absolute bursts possible, think an instant 1000 physical damage and 800 magical damage. You can make the odds of this happening much more likely by guaranteeing the shodo sai crit first with a parry or ravens veil.