Hershey Park, Dorney Park or Six Flags Great Adventure?

I am deciding on whether or not I should go to Hershey Park, Dorney Park or Six Flags Great Adventure. I have been to Six Flags Great Adventure 3 or 4 times. I have been to Hershey Park twice, but only when I was a little kid. I have never been to Dorney Park. on. I like roller coasters but I have never been on an upside down rollWhich park is worth going to for only one day? Please tell me based on the rides that I like to go er coaster. I also love water rides. I think Hershey Park would be the best choice because it has two upside down roller coasters that I want to go on because they are easier than the ones at Six Flags Great Adventure.