I've had a skywatcher 12" and currently have a GSO 12". I can't see any difference as far as the optics are concerned.
The GSO version has a lot of nifty features that make it nicer to use like a right angle finder, tension knobs, micro-adjust focuser, single 1.25/2" adaptor, quicker to collimate etc.
HOWEVER, it also feels like it might fall to pieces in a few years time. The Skywatcher was a lot more solid even if it didn't have the above features.
I'd just go for whichever one you can find the cheapest.
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