Ever wonder why so many crochet turotials are made using pastel color yarn? It's easier to see the stitches.
The hardest color to work with is black. Try it and see if you don't find yourself thinking(if not saying outloud) that you can't see the stitches.
That being said, I believe this photo might explain why we bother to stitch with black. The effect of contrast is awesome to behold. Makes it worth the extra time and effort.