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The contrast ratio between the background sky brightness and the surface brightness of an extended object at any time for any given location is independent of the telescope and is not improved much by aperture. If the sky brightness is brighter than diffuse object - then no increase in aperture will help, but as a general rule the more aperture at your disposal the better . There are always objects that are more composed of resolvable stars that will look better in a larger scope even in a light pollutted sky as has been pointed out.
That being said a larger scope will really spread its wings given a good dark sky!
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