As a photographer, I love the mystery that black and white images give. When viewing black and whites, everyone I speak to, wants to look deeper into the image, know more about the subject and query the emotion behind it. I also like the vintage look it gives.
When viewing colour images, your eyes tend to draw more to the colours and contrasts, rather than who you have photographed. This isn't a bad thing, but its an edge, I feel that black and white images have over colour.