I'd say it's easily Kung Jin. Because from any position on the screen, b1 or 11, or 22, or b2, or 34, or b3, etc..., the proper follow up ALWAYS leads to at least %30 meterless.
Think about that. I can neutral jump punch from ANYWHERE on the screen and that's an automatic 30%. Hell, the basic bnb is 35%!!!! It's insanely easy to do and really easy to actually hit your opponent with.