They are both beautiful . The male's color pattern is called a butterfly (body one color with the fins half that color and half another color). Bettas will nibble plant roots but cannot subsist wholly off of them as they are carnivores. I'm not sure if you saw it, but I put together a rough betta care post last week based off a lot of reading and research. It is Here if you'd like to look it over. The betta forum at fishforums.net is also a wonderful learning resource I've found.

Best wishes and congratulations on your beautiful bettas!