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There are pro's and cons to any design. The fact that the RC design is used in nearly all the large observatories across the planet is testimony to the optical design.
That said, Newtonians are a lot faster optically and that means shorter exposure times.
Issues such as image coma and optical alignment can mean the difference to some people.
Personally I prefer the RC design to the Newtonian. The lever arm effect on an Newtonian is just too much to deal with; and that is not to mention which system I think produces sharper images (but that is a matter of opinion).
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