You've opened yourself up for a boat load of advise. If your surgery is March 5th, hopefully you know all the pros and cons of both surgeries. No one but you can or should decide what is best for you for both the short and long term. You'll hear success stories and failures here.
Good luck with your decision. FYI...I've been very happy with my surgery and my PCP thought I was a nut for having WLS. I moved forward without his support and you'll have people in your life that feel the same way.

In answer to your question, you should locate a local hospital with a Bariatric center. There are also stand alone Bariatric centers that can help you. Once you find one that you are comfortable with, I would plan to attend a free seminar. At this seminar all weight loss surgery types are discussed as well as their pros and cons. Not all surgeons perform all surgery types, but they should still provide information on all of them.
My hospital worked with my insurance company and navigated all that was required. Some insurance companies won't pay for the surgery, some will pay for only certain types of surgery and some may make you diet for 6 months (documented weigh in), Others, like mine,
approved me within a day.  My Surgeon had to provide proof of 3 critical conditions. Mine were a BMI of over 30, sleep apnea and high blood pressure,
Once approved by my insurance company, I had to meet one on one with my Surgeon and then we scheduled surgery. Usually the date is about 6 weeks from that meeting. Every Surgeon has requirements. I had to meet with a Psychiatrist, have a sleep study, and meet with a nutritionist. It took me a total of 3 1/2 months from my first meeting to surgery.