Weight loss

Hi. I'm a 56 year old male, 375 pounds (BMI 50).
And I'm trying to decide between gastric
bypass surgery and the lap band.
Three out of three surgeons have strongly
recommended the gastric bypass surgery (laparsocopic Roux-en-Y).
All 3 also perform band surgery (Inamed, laparascopic)as well.
They all say that my likely weight loss with the band will
be less than the 150 lbs I need to lose.
Until I met with the third surgeon yesterday, I strongly
preferred the band. However, I think I need more info about
the weight loss and side effect that those who have had
RNY bypasses are experiencing. I would
very much appreciate whatever you can tell me.
I'm fortunate that one of the surgeons is willing to follow my
preference, whatever I decide. (He's not even ruling out the
possibility of taking out an ineffective band in a couple years
and then performing the gastric bypass.
Whatever you can tell me will be much appreciated.