I do a mixture. I started on EE because that's what SW generally start people on unless they state they are veggies.
Worked well for me and then I decided to mix it up a bit as there were days I just didn't want the one third superfree, so started doing the odd red and green. I found out I actually preferred green days (I'm not a big meat eater, I eat a lot of Quorn!) so I stick with those for the most part.
Strangely I also find my losses are better on Green weeks!