I do not know the answer to this question and I am no expert...
Having laid out these "qualifications" my best guess is that aperture will win...
I suspect that the idea that a bigger scope will suffer from more light pollution is a bit of an urban myth but I have no idea how to prove or disprove it.
Yes, dark skies are to be preferred to light polluted ones but the amount of light gathered by a scope is limited by physics...assuming you are not talking "Las Vegas" kind of light pollution but instead "normal" suburb levels of light pollution I think size will win in a 12 inch versus 8 inch battle...
But, what do I know???
Interesting question!
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