I would dare to say that in my experience, seeing plays the greatest part in resolution. I have been fortunate in enjoying a view of Jupiter nearly as lovely as the images posted here, but that was once in 5 years from my site! Saturn always looks great because there are few details to blur...
There is plenty of talk of why a refractor is better than a newt, and why a newt is better than an SCT, all of which has good evidence in theory to back it up. But nothing less than perfect sky will allow you to resolve the details you want!
(But ultimately, I recon that a large Newtonian makes the best planetary scope visually)
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