A few years ago, my doctor suggested SBD to me as well. I did it for two months, lost 50 lbs, and then promptly went off plan and gained it all back plus some. For ME, it wasn't sustainable. I need the flexibility of WW, which allows me to focus on healthy eating without putting anything off limits.
I would suggest going to at least one meeting. You get the setup materials, have the program explained to you, etc. and get a feel for the meetings to see if it's something you would benefit from. I enjoy the meetings and have missed only a handful since beginning just over a year ago. But others on here do it entirely on their own or online and it works for them. You just have to find out what works for you.
Good luck! Whatever you choose, you can do it!