Actually, the steins themselves don't cancel ouroboros, but on reaction if Hazama does any drive move towards you, you can 214D the steins (which count as a hitbox instantly and will eat his ouroboros) and you will get a counter hit 214D by possibly multiple steins which do TONS of damage and hit stun, so you could even dash in and 2C j.C j.2C stein followup for oki.
I'd say it's about even, though, because if you're spamming retardedly, ouroboros will fuck you up.