Last viewing session I had, I could not stop people from raving how good the GSO mirrors really are! I would advise getting the 12" if you intend to use it in light polluted areas, as you really do need every bit of advantage in such situations these days. However if you can travel to a dark sight & space in the car is an issue, I am sure a 10" will sufice.
I hope you enjoy your scope, whatever you decide.
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