I've been on Weight Watchers on and off for practically my whole adult life except for the year I went on NutriSystems and lost 50 pounds. For me, WW is too hard to stick to because you can have anything you want as long as you count the points. That doesn't work for me. I keep having want I want...and more and more and more. Atkins seems to be better for me because 1) I can have the things I really want - butter, mayonnaise, cream cheese, etc. 2) It's definite - you can only have certain foods at first and only a certain number of carbs. There are no questions - go over your carb limit or eat something you're not supposed to and you may throw yourself out of ketosis.

My advice - pick one or the other. I have a feeling that going back and forth could really be bad for you. Either one will work if you stick to it. It's just a lot harder to stick to WW (low fat) in my opinion.