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This has been done to death elsewhere, but in short, the fewer guiding corrections you have to perform, the better the image.
Standard EQ5/6's typically run close to an arc minute in periodic error.
G-8 typically +/- 8 arc sec. G-11's +/- 5 arc sec.
Figures will vary if you Google various web sites, but I'd suggest the above is pretty typical.
So, the question becomes, do I want something built to a specification or a price?
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