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Hey Chris,
take the dob, mate! Add a barlow lens if you want the same focal ratio as the CPC to observe those 0.2' PNīs.
And get an observing chair for it too. It gets quite painfull in the back when you try to look through the eyepiece with a bent back at certain elevations of the tube.
As for photography, I wouldnīt recommend any of the two. The Dob would be next to impossible to mount on an equatorial mount and the SCT would require something like a G11 or CGE and would be hard to guide with itīs 2.7m focal length.
Greetings over the ditch!
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