Regardless of which procedure you decide on, this is a lifestyle change. If you don't already have one I suggest talking to a mental health professional before scheduling your big day.
I was leaning towards a bypass, but my doctors shared with me that the bypass comes with a lot more risk, and that for the types of medications I take, a sleeve would be best. I am now 3 days post-op and while I used to have a severe sweet tooth, I can honestly say that it's been difficult to choke down some of these protein shakes because they're simply TOO sweet.
This is a big change, and I hope that you can find a comfortable place emotionally/mentally to pick a date.
Good luck!