HI,
I guess the difference between those drugs is how you respond to them. Zoloft, Prozac, Lexapro etc. have the same effect on your brain, but since thay are from different makers their chemical components are different.
I have a very bad reaction to Zoloft and was afraid to take any rugs for a year. Than I got really really bad and I've tried Zoloft. Did not have any side effects and taking it now. I feel much better, but not completely 100%.
I hope this helps. Good luck.