With a BMI of 58.1, gastric bypass (Roux-en-Y) is generally recommended over the sleeve because it tends to lead to greater overall weight loss and has better long-term success for individuals with a higher BMI. Additionally, bypass can help more with issues like severe acid reflux and metabolic conditions like type 2 diabetes. That said, the choice depends on your personal health conditions, goals, and lifestyle preferences. The sleeve is less invasive and maintains a more natural digestive process but may not provide as much weight loss as bypass for someone with a BMI over 50. If you have concerns about long-term nutritional deficiencies, the sleeve might be preferable, but if you want maximum weight loss and don't mind stricter vitamin requirements, bypass could be the better option.