The Lap-band is considered the safest least invasive procedure but can lead to more problems down the road. The gastric bypass is considered the most risky procedure. The sleeve gastrectomy is between these two procedures in risk. I recommend you discuss all of the risks, benefits, and alternatives of all of the various procedures with your surgeon.
i think that sleeve gastrectomy is a very safe surgery. All ones have some risks but are less that you decided to continue with your obesity. Remember that obesity is not just a condition, obesity is a dissease.
Lap ban have less risk but more complications in long time. Bypass is more risk that others but more effective.
Sleeve gastrectomy here in Dominican Republic is the most practice surgery, with a mortality rate in 2012 of 0.2%.