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Quality wise GSO will be fine for what you want, when compared to skywatcher at any rate.
Keep in mind though being your first scopes, that they are both *big* scopes, the 12" solid tube especially so consider how much you will need to be moving it around as well as a factor in your decision as well as storage.
If possible I'd suggest going to a shop and seeing in person the size and getting an idea of their weight and space they will take up. And if possible for you go to an amateur club or star party and try to get a look through a 10" and 12" and see the difference for yourself.
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