I used to do mostly green, but more recently have found I get on a bit better with red. I think everyone's different so it's a case of trying both yourself and making mental notes of how you feel, what foods you're enjoying, how your body is reacting, etc, and decide for yourself what works best for you.
I much prefer green days but am actually trying to do some more red days to see if it helps me as im particularly bloated...im on my second day out of 3, trying not to think bout food to be honest
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i do green on a weekday (unless i am going out to eat in evening as easier to ask for plain cooked steak or chiken etc) and red on a weekend mmmm scrambled egg and bacon mmmmmmm oops turned into homer simpson for a min there lol
I prefer green days but i have a red day mid week to give me a boost on the weight-loss, i'm too much of a carb junky to have too many red days but the odd one seems to do the trick.