color is much less forgiving man. it;s harder to compose and to take in a color photo, especially if you're doing portraits, a slight mistake in skin tone may make you cringe at your own photo, in landscape there seems to be too much information; add the nostalgia to a b&w photo and, to most people it seems more pleasing.master color though, much harder and in the case of the photos above of course, it works better.
(my mentor and friend is an older photographer named william eggleston so i am a bit biased. he is the "father" of colorphotography)