For me, it was the severity of the procedures. I was hesitant enough about WLS, but removing part of my organs was just too much for me.
Also, since I'm self-pay, I was FREAKED out complications because my insurance would not cover any complications. Lapband was far less risky, IMHO, and therefore, less of a risk financially.
I've been infertile for four years and would like to get pregnant one day, and the fact that you can remove all the liquid from the band and have a normal size stomach again appealed to me in terms of nutritionally providing for a child if I was pregnant.
It's different strokes for different folks. I think Gastric Bypass is a fine procedure and is a better fit for some people. I think Lapband was the right fit for me.
The best advice I can give is research, research, research! Good luck!