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10" f8.2 vs 11" f10. Frankly not a lot of difference in terms of magnification, light grasp or resolution etc.
The big difference is size and convenience:
1. The big Newtonian will be far too long and heavy for a sphinx mount. The leverage of the OTA on the gears will seriously overload them. It would be fine as a dob, however.
Personally I wouldn't consider the Sphinx adequate for a C11 but hey, if it works for you, great.
2. Think about where that eyepiece is going to be. On the newt you'll need a small ladder half the time, or be breaking your neck trying to look up into it.
The SCT will be vastly more convenient.
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