I'm a former Atkins, former South Beacher who is now trying to do a hybrid between the two. I've found that for me (and YMMV on this), when I eat a lot of saturated fat, I stall out. And when I eat some of the stuff that you are allowed on SB (brown rice, whole grain bread, etc), I also stall out. So, I've combined the two to get the best of both worlds - I eat lots of low-fat, low-carb stuff. Lots of fresh vegetables, chicken, and fish. Some fruit a few times a week. It's been working really well so far. Good luck!