Which type of wls keeps the weight off permanently?

I am trying to decide which surgery to have, the lapband or rny. My main concern at this point is which one will keep the weight off better after 5 years out. I keep hearing about people who had the rny and gained back a lot of weight years later even though at first they were successsful. I know i can lose weight with either procedure, but keeping it off is the truly hard part. If i have the lapband and i start to gain weight back say in 5 years, can't i just have a fill and put a stop to it before it gets out of control? I am afraid that in the long run with the rny i will get used to eating too much again and gain it back. I know someone who had rny and lost 150 lbs. but now has gained back at least 30lbs and is gaining every day. Foods she couldn't eat after surgery like high fat foods are no problem for her now. It even says on this website under types of surgeries that a con for the rny is the possibility of gaining weight back. That terrifies me. I think the answer to this question is the key to my choice of surgeries. Can anyone give me advice on which type of surgery will keep the weight off more successfully long term ?

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