If they are both f5, then many including I would tend to go for the 8" in such LP conditions.
Generally speaking, large aperture is not desirable in heavy LP. For instance my ed100 a 4" refractor gets more use than my 8,10,12" Newts under light polluted skies, depending on the targets.
I avoid these kind of threads like the plague usually.
Whatever you choose Justin, you sound like you are on the right track to making it work out, there are plenty of options for either scopes, 8, or 10".
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