My doctor, a bariatric surgeon, explained that generally, laparoscopic sleeve gastrectomy is often considered to have a lower immediate complication rate compared to gastric bypass, making it 'safer' for many. However, gastric bypass can offer more significant and sustained weight loss for some. The decision on the 'safest' and most effective surgery is highly individualized, based on patient's BMI, comorbidities, and overall health status, requiring extensive pre-operative evaluation and discussion with the surgical team.