I have a Saxon 6" f8 dob that is quite a capable scope with a very good mirror,(same as a Skywatcher !) and am very happy with it . managed to take some reasonable planetary images with it last year.
The altitude bearing system and the focuser are the biggest drawbacks but with some tinkering they can be made to work better.
Have not looked through a GSO 6" f8 newt/ dob, so cannot comment about comparisons
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