I really don't know. You might google the different ones, especially looking for discussions on forums and see what people post. Everyone's body responds differently, but there are some that are notorious for weight gain, and others that aren't quite so bad.

Askapatient.com is a good site to check out as it's patients posting their experiences from wonderful to horrible. I suspect that if weight gain is extremely common with a certain med, it will be noted on that site. I haven't checked it since I was put on a hormone replacement that made me sicker than a dog years ago.