What surgical procedure is best for weight loss?

I am 28, 5'2 and weigh 180 lbs. My BMI is 32.9 and I am considered obese. I have tried diet, excersise, and phentermine with no results. What is the best possible treatment for me to loose at least 60 lbs? I've looked into gastric bypass, gastric sleeves, and liposuction.

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