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I find SCTs just as easy, or easier to collimate than a Newtonian. I've also found planetary better in the SCT as well, probably due to the longer focal length though. SCT is also more compact and doesn't get diffraction spikes on stars, though some like that look.
For DSO work, some SCTs allow you to use a hyperstar attachment and image at F1.9 which is a real benefit. Otherwise the newt has the advantage in being cheaper and some of the other advantages listed here already.
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