Question

justify the statement that it is better to have colourblind father than to have colouredblind mother?.

Answer 1

Because the colour blindness can pass on to you

Answer 2

A colorblind mother is a carrier of the disease and probability of affected offspring is 100% (either diseased or carrier) but if father is affected than probability of affected offspring is 50%. 
This can be calculated by making punnet square.