Hi. Barbie welcome,
I decided to have the band because it’s reversible if something goes wrong or if later in my life I get sick. With the band they are not changing/re-routing anything in my body. My advice to you would be research them both, weigh the pros and cons of both and then make you decision. This site has a lot of good info on it. Some have had success with the band some have not. Good Luck
Ps: In my opinion with the bypass you may lose quicker but you will have more loose skin, and a greater chance of gaining it back.