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I can tell you seeing makes or breaks images with an SCT. I only use my C14 for planetary imaging and you have to be patient and wait for the right night. Especially for planetary imaging. For DSO work it is still a concern but less so. With good guiding and a well tuned imaging system you can produce good results in average seeing conditions. There will be some blurring but the results will be streets apart.
Light pollution always needs to be dealt with the same way with each imaging system you use. You will be limited by how quickly your system shows the light pollution. You might use a light pollution filter to help. Using an SCT will not change any thing you need to do to limit the effects of light pollution.
There is also the problem of dew on the corrector. This can be problematic in that you need to keep heat on the corrector and that can effective create tube currents and limit your systems ability to produce sharp images.
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