I'm going to ask my doc to switch me from Zoloft (sertraline) to welbutrin. My friends that take it like it & the weight gain among others I'm done with any advice?

Talk to Doctor. Sounds like you have a good idea of what you would like to do. Now you need to have a discussion with your doctor. Explain your concerns about your current medicine and your desire to change. See what your doctor says and move forward from that point.
It might work. They activate different pathways in the brain so they are not equivalent. Many people do better on one than another. Check with your doctor and see what they recommend.