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Hi Matt,
I won't get into the comparisons with the optics and focal lengths, that will be for others to give you some good advice.
What sort of observer are you? or want to be? Naturally, the SCT with a drive will be an advantage for imaging, but more importantly it will help you keep track of you objects as you observe for a longer period of time. With a Dob you will have to manually keep the object in the centre of field of the eyepiece. But if you think you would like the challenge of Messier marathon's and location many deep sky objects in on evening, then perhaps the 10" Dob.
Just my 2 bob's worth..
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