I spent a lot of time going back and forth between gastric bypass and gastric sleeve trying to decide which to have. I ultimately decided on the sleeve, but I think there are pros and cons to both.
From what I read, and these are all statistics, not personal stories, so of course there are always exceptions to the statistics. Statistically, gastric bypass patients have a bit more weight loss than sleeve and maintain a bit closer to goal. Gastric bypass is a hair more successful at sending diabetes type 2 into remission than sleeve, but both can be effective. The sleeve creates a high pressure system which can exacerbate GERD to an unmanageable point so it is rarely recommended for people who are already diagnosed with GERD.
However, once you are past the initial major complication of sleeve (staple line leak) there seem to be few major complications to contend with. The main one seems to be GERD. But in gastric bypass there are statistically more serious complications that can develop later in life.
This could be due to the fact that sleeve is a newer procedure and there is less statistical information available that bypass, or it could be that it actually just less likely to have medical complications down the road.
It's such a personal decision and based on so many factors. I wish you all the best in making your choice!