Hi rharbord,
Will try and help where I can but might be worth a look on the simply filling subforum for more info.
Simply filling and filling and healthy are the same plan just different people refer to it differently as far as I'm aware. This is where you eat your meals from alist of filling and healthy food and anything that is not on the list is then taken out of your weekly pp. These foods are highlighted in green in your ww book. In a sense its similar to sw but without the hex a/b etc.
You can switch daily between pp and sf if you need to which gives you more flexibilty. So if you want a day without the counting and measuring then sf is ideal. Hopefully this helps slightly.
Good luck
Dan x