One Anastomosis Gastric Bypass (OAGB) has become an accepted standard bariatric procedure almost worldwide. Nowadays, in some countries it replaced even Sleeve Gastrectomy (SG) as currently most frequent bariatric-metabolic surgery. The question may be uprised about the standing of OAGB in comparison to the globally still most popular procedures SG and Roux-en.Y Gastric Bypass (RYGB). The answers are difficult to determinate as large cohorts of OAGB have ususally been studied with this procedure only. Nevertheless the author undertakes the attempt to present the relevant available data of comparisons between OAGB on one side and SG respectively RYGB on the other. As a conclusion of the results, OAGB seems to be a very safe and straight forward procedure. Its operation time is significantly shorter than in RYGB. Concerning weight loss and remission of co-morbidities, OAGB shows better short and mid-term results than SG and at least non-inferior results than RYGB. If slightly better results have been noted with OAGB this may be mainly due to the longer biliopancreatic limb in OAGB. RYGB is the superior bariatric operation concerning improvement of pre-existing gastroesophageal reflux (GERD) and avoidance of new-onset postoperative reflux. Even if OAGB in total seems to cause less symptomatic GERD than SG, the inherent risk of chronic biliary reflux remains the achilles tendon of OAGB, beside the need for lifelong vigilant follow-up and reinforced supplementation to avoid nutritional deficiencies.