Research all your options. Get a second opinion if you don't feel comfortable.
It's a personal decision what surgery to have, no one can make it for you.
I personally did not want a bypass and I have other health issues that make the malabsorption probably not a good idea. Sleeve wasn't being done by my surgeon at that time and frankly I didn't know about it.
Would I have chosen the sleeve if it were offered to me then? Best answer is maybe. I just don't know.
My surgeon did suggest RNY (bypass) to me twice, but I turned him down and here I am now banded. :)
I do know that I've done well with my band, but I made major changes in what I choose to eat, and how active I am. The band is only there to help me.. I am still in control.
Would I do the band again? Yes I would. Even if I have problems tomorrow, I'll still be happy that I got banded almost 2.5 years ago. There is no perfect surgery, there's no "one size fits all", there's no "if you have this much to lose you MUST have this surgery". The band IS a slower method, but that suits me fine. The weight didn't come on fast, it can leave slow too.
Best of luck on your decision, whatever surgery you chose, if you follow your doctor's guidelines, you'll likely do very well.