It's really a matter of personal preference. As you said, the green blends better outdoors. There isn't really a pattern that "works" for CQB since you encounter all of the colours in the rainbow and your main goal should not be to blend in. If you're asking for opinions the consensus will be to choose green.
Something to consider is that the green vest will "match" with almost any bdu you chose. The UCP aka ACU really only matches one bdu.
Last edited by Kozzie; January 30th, 2013 at 01:09..