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and its okay Brendan, I'm not a fan of Newts or Dobs 
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Hi Peter,
As a visual instrument there is not one single performance criteria where a SCT telescope can outperform a newtonian and in many performance criteria as a visual instrument they are clearly inferior.
There are many reasons why people want to own and use a SCT for visual astronomy and they are vaild for each individual and their circumstances, but optical capability isn't one of them.
If you want I am happy to spell each and every one of them out for you. Its pretty simple optics and physics. The optical and physical theory is backed up by what I have experienced at the eyepiece comparing the two scopes countless times over several decades.
As an imaging telescope it's a whole different ballgame.
Cheers,
John B