Having been to 7 Six Flags parks (GAdv, OT, Fiesta, OG, NE, America, and St. Louis), I think my overall favorite might be Fiesta Texas. I was very pleasantly surprised by the park's charm, location, and I really enjoyed the time I spent there this past summer. Of course it has its rough spots here and there, but I've yet to find a Six Flags park without rough spots. Great Adventure, Over Georgia, and Over Texas are also great parks with great rides,there was just something about Fiesta that made it stand out to me.