Welcome! You've found a great place to ask questions, vent and find lots of support.
If BMI was the only indicator for surgery type---yes, most everyone here would need to have DS. But that's just not the case. There are lots of things to consider, as I'm sure you're discovering, while doing your research.
It's certainly possible to lose the weight you need with a VSG. But like with any of the surgeries, it takes commitment and lifestyle change. We say that allot---but it's critical to success. With VSG, you'll find the restriction you need to help with the portion control issues. But you'll have to make those good food choices, take your vitamins, spend some time tracking and planning your diet and, yes, finding some exercise to do that is appropriate for your fitness level. As you're weight declines, you'll be stunned how quickly you'll be able to do more activity.
Do your research and as you have more questions, general or specific, feel free to ask away!
Elaine
edited to add--you might want to check this out. It was just posted on the VSG board.
http://vsgfaq.wordpress.com