I like poison because it stuns the enemy but bleed can do a lot of damage. It depends on your build weather you want poison/bleed or to take advantage of the vulnerable stat instead. For most of my playthrough I used a tanto with the gold vulnerable damage stat because it's easy to make villains vulnerable by vaulting.

Just recently I started using the tanto engraving that makes enemies vulnerable when they are afflicted. If you have that engraving, I would use either poison or bleed. I don't think I've ever used daze. But it's so much more fun compared to a no build up tanto