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How can we say the reflacting type is better then that of refracting type?

can you clarify - better in what sense ? type of what ?
is your question is on Telescope. Clarify



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Reflecting telescopes are better than refracting telescopes.  Double reflecting (with one objective mirror and a secondary mirror) telescope with an eyepiece lens is quite advantageous over refracting telescope.  These are called Casseygrain telescopes.

Most of the incident light energy / power is reflected by the reflecting (parabolic or concave) mirror.  In refracting lens some light intensity is lost.

 In refracting telescope use of a lens has side effects such as color (chromatic) aberration.   There is no spherical aberration in a parabolic reflector.

The refracting (lens) telescope has to be bigger and heavier.  Mirror weighs less than a lens.  Due to the reduction in weight, a much bigger reflecting telescope can be made and supported at the center.

The image in a reflecting telescope is clearer.

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