Your weight loss will not stop if you follow extra easy, SW would not have brought this plan out if that were the case. Fill a third of your plate with superfree and you won't go far wrong, you are also only allowed one A and one B, thus allowing for the extra free food.
I've never done a week of green, red or EE, I mix it up depending on what I fancy and what I have in the cupboards/fridge. I tend to have more green than red as they work out cheaper but I then have a couple of red days or EE.
Some people say green days make them bloated, some have red for a couple of days before WI, some can only do green as they are vegetarians and they still lose.
It really is a personal thing, we can all tell you what works for us but it may not necessarily work for you. Give it a try and see how you get on. There have been some amazing weight losses on EE in my group by the way!!