I would never get bariatric surgery. That changes how you eat forever. Some people may say dieting changes how you eat forever, too, but at least with that, you can once in a blue moon overeat. If you do that after bariatric surgery, you can get really sick.
The way I see it, if I had the willpower to stay on the diet I'll need to maintain after bariatric surgery, I wouldn't NEED the surgery! I could use that same willpower to lose the weight by dieting alone. However, I know that I don't have that willpower so I would be setting myself up for failure after the surgery.