I have a 10" skywatcher dob (not GOTO) and am happy with the quality of the assembly and the optics, I asume that the 12" would be of similar quality. I have no experience with orion scopes but as a point of interest most skywatcher dobs have the primary mirror set far enough up the tube so you can get focus if you want to attach a camera at some stage, not sure about orions. They are probably both good quality scopes.
Cheers Rick
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