I think the choice must be guided by what we are wanting to say about the subject we are photographing. Take, for example, the two photos below. They are the same shot presented first in colour and secondly in black and white. In the first I feel the picture is dominated by the colour. Yes, I am aware of pattern and texture but, on balance, it is the colour that significantly influences my response. In the second I am far more aware of the pattern and texture elements – the colour does not really enter the equation. The two shots give quite different interpretations of the subject.