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Im guessing you mean Ritchey–Chrétien rather than just the brand name RCOS (which used Ritchey–Chrétien mirrors).
Newts and RCs both have pros and cons. Collimation is much more difficult generally on RCs (Hyperbolic mirrors) compared to Newts (Parabolic mirrors), others will explain why.
RCOS was an unfortunate term to use, RCOS made scopes so stable and robust, that the need for re-collomation was rare compared to other RC brands. Ive done it once on my RCOS.
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