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Haven't looked through a 12" of either but I have a 10" Saxon which I believe is same as Skywatcher which has a very good mirror. Seeing permitting, I can routinely use a 5mm eyepiece on planets with it, and when it's really good, a 4mm as well. A friend has a Bintel 10", same as GSO and that works very well too.
My Saxon has a pyrex mirror, but not sure if Skywatchers use pyrex anymore? GSO is BK7 I think.
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