Greninja 5 / Mario 5:
49.1% of the votes |
Greninja 6 / Mario 4:
33.3% of the votes |
Greninja 4 / Mario 6:
17.5% of the votes |
Greninja wins neutral consistently vs. Mario, and can also abuse Mario's disadvantage. Greninja also has the upper hand in terms of mobility, as well as range. Greninja's bait and punish game also hurts Mario quite a bit.
I'd say Greninja beats Mario, personally.