Much bigger deal
Lap bands are relatively simple, easy to perform, and to remove.
They don't have as good a success rate as other ops, neither durarion of success, or amount of wt loss.
Gastric bypass, roux en y
more common "permanent" surgery. Duodenal switch is major reworking of plumbing; gives greater wt loss, longer, but more complicated and more problems with nutrient deficiencies. Talk with your doc.