Newtonians from my experience produce lovely images but all the really sharp hi res images come from either a RC or CDK. I see plenty nice wide field stuff with a Newtonian but never see any hi res stuff. This is the strength of the RC and CDK. You buy one of these for sharp hi res work and nothing more than that. The wide field well buy a Tak, AP (if you can stand the wait) or even a hi end Newtonian like ASA (if they ever get their act together with flexure).
It is purely an opinion but all the top imagers have this gear and that says a lot to me.
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