From the New rules of lifting:
In a recent study, resercers at turfts- New England Medical Center put overweight and obese subjects on one of four popular diets: Ornish(super low fat), Atkins(super low carb), Zone(balance protein, carbs, fat, Weight Watchers(calorie counters)...
average weight loss
Atkins: 4.6 lb adherance 53%
Ornish: 7.25 lb "" 50%
WW: 6.6 lb "" 65%
Zone: 7 lb "" 65%
This means that the diet that showed better results was the Ornish; however, you are more likely to stick with the WW or Zone diet in the long run.
Now it's your turn to decide