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Answer:
Both types of telescope can suffer from a defect called spherical abberation so that not all of the light is focussed to the same point. This can happen if the mirror is not curved enough (shaped like part of a sphere instead of a paraboloid) or the glass lens is not shaped correctly.
1) refracting telescopes use lenses that are subjected to aberrations such as chromatic aberration that can cause different colors to focus at different points giving a blurred image;
2) a lens can only be manufactured with limited radius due to the difficulty in making it and defornations that a big lens would have (bending under its own weight); so the lens is bound to have a relatively small diameter and, as a consequence, to collect little light (light for a telescope means infornation about the object; the more light the better!).