With astro photography bigger is better, most people want more aperture and lower f ratios. The only downside is that bigger is harder to work with. The ED 80 is a great starter scope but is wide field and you'll soon be wanting a bit more focal length.
Can't comment on the Schmidt Newt, they don't seem to be a popular choice when compared to the amount of fast newts and RC scopes being used by people here? Finding the right scope is hard, which is why a lot of us have more than one.
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