not sure how they compare now but i prefered the skywatcher dob base compared to the GSO base, the 'tension handle' works well and the laminate is a better quality which means its a bit smoother to use but the skywatcher R&P focuser is horrible and would make trying to collimate with any real precision a waste of effort in most cases.
you can fix the slop in the skywatcher focuser by tightening 2 allen screws but this makes it a bit stiffer to turn.
(im comparing my old 12" GSO with my older 6" skywatcher dob and i know that GSO has changed the design of their altitude bearings now)
both makes are very usable out of the box without any modifications.
i'd just go for the one thats offering the most extras..
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