I like both B/W and color, I think it just depends on the subject matter and also the impression/mood you're going for. I really like the first B/W image here, and in this case I do think it's stronger than the color version you posted in another thread. In monochrome, there's a luminous quality to the image that adds a sense of mystery, and the lines and textures of trees are more prominent than in the color version. In the color version, the combination of the motion blur and the strong colors created an effect that to me looked more like graphic art than a photograph.
The last color image here is really nice though; that way that last little bit of daylight glances a few of the trees creates a nice effect, and the colors are subtle enough that they enhance rather than distract.