The point is that Logic, which is sort of analogous to IQ, would not affect how good I am at FPS games. It would rather be my sense of aim, which Agility is by definition. I mean, all combat skills use it to aim and hit.
Once you're jacked in though, your Agility is moot.
Also, this is what Logic is:
The Logic attribute measures the cold, calculating power of your rational mind. Whether you are attempting to repair complicated machinery or patch up an injured teammate, Logic helps you get things right.
This is what Agility is:
Agility measures things like hand-eye coordination, flexibility, nimbleness, and balance.
Given these two, I'd definitely say that Logic is the brain's Agility. And, when you're in VR, you're using your brain entirely instead of your body, I'd go with Logic for Gunnery.
THAT SAID, this is just my ruling.