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The way I understand it Rastis is because the refractor has no central obsruction the contrast is better. However there is a trade off. Unless its an apo or semi apo or ED type refractor you may find that colour fringing (chromatic aberation) around the solar system bodies, particularly the bright Moon, Venus and Jupiter, may be objectionable. Reflecting type scopes shouldn't suffer from this problem, but they may have less contrast.These are not hard and fast rules simply because the difference in quality between scopes will have a big impact. EG A good quality newt may well have better contrast than say a poor quality refractor.
Oh and one other thing. A smaller aperture scope will often be less affected by seeing conditions than a bigger aperture scope.
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