This is the lamest joke I've ever seen on the internet - go to the corner and think what you have done... Okay, getting to the point...
On Attack Potency, Neo Metal Sonic is 3.5x stronger than Neo; the former's AP being 877.81 Tons of TNT and the latter's AP being 249.48 Tons of TNT. Neo's Aura helps, however, in lowering Metal's AP disadvantage by the virtue of making Neo a bit buffer, and her skill does reduce the number of attacks that Metal could land on her... Until his power mimicry kicks in and renders Neo's potential skill advantage moot cuz it is bullshit, and that is even ignoring the fact that Metal could possibly copy Aura although I'll admit I am just throwing out this possibility, and don't consider it actually possible.
I think Neo's Semblance probably wouldn't be all too useful against Metal. Again, Metal's Power Mimicry is bullshit, and he could possibly copy it. That, and I don't think Neo's Illusions can actually hurt anything, so they won't be too helpful 'sides distracting Metal; which wouldn't be too useful considering Metal also has Sonic (duh) and Shadow's abilities in this key, so Metal has access to Sonic's Kit and Shadow's chaos control and chaos spear (and he, and Metal by extension, possibly has Time Stop) so point against Neo, again.
... Idk, what Metal and Neo's speeds are in numbers, so I assume they are about equal in this regard. Lifting Strength is also 'bout equal, so can't comment much about that.
Neo has too uphill of a battle for me to vote for her, so I vote for Neo Metal Sonic.