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I agree with Steve also - the 8" dob will give you better views (imo) than an 8" SCT.
The SCT has other advantages, like being potentially more portable (shorter tube) and usually goto-fitted on a fork mount.
So rather than narrow your choices to 8" dob or 8" SCT, think about whether you really want GOTO or you're happy to use star charts to find the objects you want to see.
Goto and tracking increase the price considerably, and take longer to setup than a dob. But it is nice to be able to push a button to take you to an object.
Dobs can be fitted with DSC's such as Argo Navis, which will give you "push to" instead of goto, so you can still find those elusive objects.
What's your budget?
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