Why is the DGB/DS said to be more dangerous than the RNY?

I am planning to have WLS and have been researching to select the procedure I wnat to have done. It appears to me that the most dangerous part of either surgery is the intestinal rearrangement (due to the potential for malnutrition). As far as I can see, the malabsorption measures in the intestinal rearrangement are the same for both procedures, with a common tract of 100cm or more being reasonably safe. The difference I see between the two surgeries is in the volume restriction measures in the stomach with the RNY creating a pouch and the DGS/DS leaving a sleeve shaped stomach with the pyloric valve still functional. My questions are: 1) Is my summary above correct? 2) If so, what is the advantage of the RNY? Why are there so few DGB/DS surgeries?

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