Board Thread:VS Debates/@comment-27177230-20170813091904/@comment-31816534-20170813135730

Round 1: Shadow wins not for strength, not for speed, but for the Hero, Chaos Boost, and Dark forms. All of them grant Shadow invulnerability. Pus, he can defend himself against Zero using Shadow Guard and Shadow is more likely to stop time first because that's Shadow's battle style.

Round 2: Super Shadow due to the immense difference in power. Plus, I don't think Zero will try to wear out Super Shadow. Not to mention that he doesn't specialize in hiding from people because he's Zero.