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There are plenty of comparisons made over the past 40 years that show a well-made f/15 Mak easily outperforms an f/10 SCT of similar aperture when it comes to image quality (Strehl or MTF) for planetary imaging - when side by side in the same seeing.
In terms of bang-per buck, the SCT's win as noted previously; an 11" SCT will slaughter a good 7" Mak costing much the same.
But if cost is irrelevant, and the comparison is based on equal aperture, the Maks will usually prevail.
There remains a very valid question, however: would I prefer to be lugging my 7" Mak or an 11" SCT next Saturday night.
I don't know the answer, to be perfectly honest.
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