Of course there are pros and cons to both.....I crossed Bypass off the list because of the long-term complications I've read about in several studies published in medical journals from the Bypass and malnutrition, as well as searching for patients who had the surgery over 5 years ago on forums (I couldn't find many). There are complications that can arise with the band as well, but the band, you can take it out if you run into trouble. The bypass is for life-complications and all. Please, please look into the evidence (and lack of long-term info out there) that shows the problems so many GBP patients are having getting in the necessary Vitamins and minerals. Long term Vitamin A deficiency means you could lose night vision (no more driving at night!). Long term Calcium deficiency means you could have early onset osteoperosis and break bones easily. These things are happening to people who have been taking all of their prescribed supplements. There's just not a whole lot of positive evidence from cases 10+ years out from having GBP surgery. And yes, I am extremely obsessive in doing this kind of research! Did patients lose the weight, and quickly? Mostly yes, but at what price in the long term? It bothers me that people aren't talking about this more. We are supposed to be turning to WLS because we are done with the "quick fix" method to weight loss (meaning losing a lot and losing it fast), so if that's the attraction for anyone, they need to put that aside when making their decision.
My BMI is 47-point-something, and I am actually looking forward to putting in the work in my eating choices and exercise this time because this time, I will also have this tool as an additional motivator and assistant in fighting hunger. It's going to take longer than if I had chosen bypass, but I'm okay with that. I think if you are going to be successful with the band, it doesn't matter how much weight you need to lose, what matters is that you are willing to change your life; commit to healthy eating and exercise, and the band will help you get to your goal.
Of course, whatever you do decide is what must be best for you. Just weigh your decision very carefully and practically. And good luck to you!