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I think mak's have all spherical surfaces.corector.primary & secondary where as a SCT have a strange curve which is more difficult to get right in the corrector.
However mak's usually have a longer f ratio which makes them heavy & expensive when you get to bigger sizes so you don't see many above 4-5".
Also because of the curved corrector of the mak(thicker), cool down times will be increased.
In theory i think mak's give sharper images..it probably depends on the company making the product
I am very happy with the sharpness of my 5" mak,
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