The only difference is that; one is red and one is green. Mine is black, my last one was blue.
EDIT
one other thought, green boards are typically found in pre-built systems that often lack some of the more interesting bios options. I've seen very few green boards that had overclocking options, so I guess that would make red better, but a new green board is probably way better than a 5 year old red one. So again, it's really just what color they decided to make it.