Although it was written in 2013, I find this quite interesting.
Especially the Key Points, and different BMI readings with their predicted losses.
It also mentions weight re-gain in all of the procedures, if permanent life style changes are not made.
Sugar gets absorbed 100% ..... every time ....
Anyway, here it is:
http://www.obesityhelp.com/articles/choice-of-bariatric-procedure-a-philosophy-obtained-in-20-years-of-bariatric-practice-2