I guess I've never personally done the experiment, but I've always assumed the vitality adds extra offense. My supports with both disks usually crit above 200k.
Also, ZA + health disks is one of the best combos you can get. I get red crate every time, I frequently run 2 ZA's, 3 Vitality/Unbreakable, and 1 Vanguard to get the locked taunt.
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