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Optically, they are probably the same, although I'm not a fan of the Kellner eyepiece on the Ozscope Dob - Plossls are better IMO. I would go for the GSO, as it has a 10:1 dual-speed focuser, and a better range of eyepieces. The primary mirror also has a fan.
Warranty is a consideration, but for most users of this gear, it doesn't often become a problem.
Cheers
John
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