definitely attend the seminars! This is where you will get the medical information on each procedure and what limitations, side effects - both good and bad, from. Its important to base your decision on what YOU wish to receive out of the procedure - all will help you lose weight. None are magic. You still have to do the work. But its the difference between building a house using your bare hands, or having a hammer to pound in those nails. Here are some of the major points:
Lap Band - removable, adjustable, foreign body, can errode, less overall weight loss, no large pills.
Gastric Bypass - reversable (although not easily) fast immediate weight loss, chance of dumping syndrome, rerouting of internal organs, malabsorption, extra vitamins needed for life, no NSAIDS, not suggested for those with acid reflux.
Sleeve - not reversable, steady weight loss (between band and bypass), removal of 85% of your stomach (including part of stomach that produces hunger-inducing hormone ghrelin) , anatomy stays in same order you were given, no foreign bodies, can be used as phase 1 of a duodenal switch - which adds malabsorption to the procedure, few pharmaceutical restrictions, can help end acid reflux.
These are what I received from one fo the seminars I went to - what's funny is, for me, the Sleeve was the most appealing, even though they were actually pressuring for people to have the bypass.
I know people that have had each of the surgeries. Of these, I know people that have succeeded and people that have failed - with each and every one - and its not because of the surgery, it was because they didn't address their own personal issues. If you absolutely cannot stay away from sugary foods, maybe the bypass will be right for you - at least there's a consequence with that one. If you're just an overeater, sleeve may be beneficial to you, especially if you have other issues, like CONSTANTLY feeling hungry. If you've got less than 100 lbs, to lose and you're just looking for some portion control, maybe its the band. You have to decide for you.