I think the biggest difference (Apart from the obvious physical size) is that an SCT on an EQ mount is likely to have the eyepiece in much easier places to deal with than a Newtonian.
On the other side, if you are looking for DSO's and AP, the field of view restriction of an SCT might be a bit of a killer. I know on my CPC925 the FOV is very much limited compared to other scopes.
I like my SCT but there are times when I would love a greater FOV to play with.
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