Sion Omega

Probably break will. You get to use it more often.

I'd say the omega on Held by Hatred isn't really necessary, the extra 20% health is only helpful if you use it when he's got a sliver of health left, but even if you only recover 80% health, you still get an immediate turn and you'll likely get that last bit back under an EP lead since anything you do inflicts Pain and heals 20% health.