there is discussion from Cloudynights
For lunar/planet viewing, I would choose the C11. In most locations, the usual mediocre or poor seeing compromises scopes above 6-inches or so. Combine the seeing with objects that are not always positioned perfectly high in the sky and both of these scopes will be affected. The Mak might produce a very slightly sharper image compared to the C11. The C11 will produce a brighter image and will have more resolving power when the conditions are good.
The C11 will be better for deep-sky viewing and imaging. There is a comparison here on CN between a high-end, 9-inch Mak and a C11. The C11 came close in most observations so it should deliver better performance against a commercially produced 7-inch Mak. (meaning C8 is inferior to a Mak7?)Mak might not be the most popular CAT telescope, but definitely qualified for planetary imaging
There is actually no competition between these 2 leagues. The skywatcher mak are 2700 mm focal length and below, and prices are lower.
The only competition are the Skywatcher Mak 127 and Celestron C5(150mm aperture), with similar focal length (1500 vs 1250mm)and price(USD 435 vs USD 460).
see astrobin
another CN thread.
ioptron Rumak review
ian morison on mak survey
spot diagram of Gregorian maksutov
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