Lap band proved to be so statistically unsuccessful and had so many complications that our surgeons here won't even do it anymore. RNY is completely different. It's not just the restriction that works, it is the hormone and metabolic reset that happens. When the brain/stomach hormonal communications are so damaged from yo-yo dieting, RNY can fix this. Also, with WLS , the metabolism does not bottom out like what happens with a non surgical diet of caloric restriction. I am approaching 1year post op RNY. I don't have a lot of restriction now - there are still some foods that can bother me - like raw salad, but generally I can eat whatever I want. The thing is, I just don't want the bad stuff anymore. I have so much energy and with exercise, I believe I have added some muscle mass. My metabolism is definitely, without a doubt, much higher than it was before surgery. As long as I exercise, eat the right foods, and log everything (I write it all down. My rule is that it must be written before I can eat it. I don't count calories now - just log the food.), I will be able to maintain my healthy weight.
Lab band is pure restriction. RNY is much more than that.