Hiya tp,
All of those scopes are easy to use, the main difference are, that the 6SE is easy to move/setup (with regards to carrying, putting in car). An 8" dob will allow you see fainter objects than the 6SE, but setup transportation can be a little more challenging. You couldn't really move any of them around without some disassembly anyway, so I guess that isn't really an issue, but a 6SE is slightly easier to store, and load into a car.
If you really aren't sure, I'd still recommend a regular 8" dob, that pushes you to learn some "celestial navigation", but if you aren't any good with maps, then maybe GOTO is the way to go.
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