First A1c since surgery!
The working theory (as the unscientific me understands it) is that the procedures that remove or disconnect the fundus part of the stomach or the duodenum have a better effect on blood sugar than the restrictive procedures. So surgeons do recommend the malabsorptive procedures for diabetics.
I am not a doctor, nor do I play one on TV, but when I was doing my research for procedures, I asked on the lap band forum about how fast one's diabetes came under control. I was surprised at how many people posted and told me that for them, the answer was "immediately."
II think the post-op diet might have as much to do with it as what's removed or disconnected. While it's true that I can still eat simple carbs and dumping provides a disincentive for eating simple carbs (and therefore I am not automatically cured of diabetes by virtue of my surgery), all WLS patients are supposed to eat a protein-heavy diet. Protein has a stabilizing effect on blood sugar. And as little as a 10% weight loss can improve many an illness, including diabetes. We all get to 10% pretty quickly after WLS.
Just my very unscientific observations.
Edie, that is how I understood things as well.
I'm not a diabetic, but I am insulin resistant. I initially wanted the lap-band. I thought about the faster loss, and became somewhat interested in bypass. Then, I talked to my PCP who said that this year he was going to put me on Metformin because my borderline numbers were inching dangerously close to the Diabetes side. That made up my mind.
But, here you are, using the tool, the lap-band, and having it help you learn to control your diet and your health so very well. Congratulations!!

Hugs!
Kathy
Kathy