what is the difference between open rny and extensive gastric bypass

I would like to understand the difference between the two surgerys, open RNY and Extensive Gastric Bypass ( Biliopan Creatic Diversion), I have viewed the different surgery page and still do not understand, it looks to me like the latter of the two would be the better of the two, as far as fast and most weight loss. any help anyone can give me would be most helpful. tks ann

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