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Refractors are generally regarded as having better contrast so for a given aperture size you should be able to make out fainter stuff, also a good refractor can give very sharp views. Of course for a given aperture a quality refractor is also more expensive, plus it gets hard to compare apples to apples when looking at larger apertures as they just don't make refractors as big as reflectors - and that's ignoring all the quality issues like CA, coma, etc...
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