Hi Destiny, welcome to you too!
The momentum program is really good- I can't speak to a comparison to previous programs since I have only ever done momentum, but I find it to be really easy to follow and a realistic plan that works with my life. I like that you're not restricted to eating processed or tasteless food, and i love that i can still eat things like cheese, potatoes, pasta, and dessert. It just makes you think more about portions, and I've found that I'm satisfied with a lot less than what I used to eat. Sometimes I even have trouble finishing all my daily points!
I understand your frustration with the thyroid- my doctors always think i have the same program because my body fights me so diligently whenever I try to lose weight, but my bloodwork always comes back negative...nevertheless, I know what it's like to have a body that seems to be working against you! I would really recommend the program- It's working for me, and obviously many other people here have had great success also. If you stick to your points it WILL work. I wish I had started years ago! Best of luck to you