People do seem to very loyal, to the point of defensiveness, to either one or the other!! I've never done SW, but I am a big fan of WW. I needed the points system to tell me when to stop eating, because even when eating healthily, I just ate too much of it. The portion control aspect of the WW points system was essential for me. And I was never really hungry, if you get our head around it and use your points wisely, and fill up on veg, it's not hard.