Neither! Juice of any kind is accompanied by calories from sugar and additives. Your best bet is good overall nutrition and exercise without fads or quick fixes. Celebrities we watch looking great shortly after having a baby have the time and luxury of personal trainers and excellent calories sources.
No just works as. Laxative. For flatter abdomen eat healthy & get physically active. Calories burned > calories consumed. To tighten ab's: crunches, reverse crunches, exercise ball crunches, pelvic thrusts, lying leg raises, side bridge & “bicycling” exercise on back. Engage in regular aerobic exercise (i.e. running, swimming, Nordic track, bicycling, kickboxing, walking, cross country skiing, hiking, etc.)