HI!
Oh boy, this is a hard step to take, which one does what, how will it make me feel, which one is best, etc. I'm sure your head is reeling over it - mine did too.
What I learned though is that that no matter what one you choose, you are not making a bad choice. In the end, from what I've read, they are all equally effective. Some of the things they tell you to include in your decision is how often the med is administered, and the size of the needle and side affects.