Virginia,
The lap band is less invasive. No re-routing, no mal-absorption. If it were me I would go with the lap-band first. What do you have to lose (other than a little excess weight). If you do not get the results you want with the lap-band, then go for the RNY.
Just my opinion. Actually the RNY scares me. (I am a real chicken) But believe me, If my health depended on me loosing weight and the lap-band didn't work for me. I would then consider the RNY.
Good Luck in your decision,
Teri