Poll: Simpsons vs Family Guy vs South Park vs Futurama?

It really is a hard decision if you as me. The Simpsons has the longevity (over 20 years), and the nobility that makes it a living classic. It's also entertaining watching Homer's stupidity and Bart's mischief. Family Guy s funny in it's own way, and I gotta admit I like the cutaway gags (even after the Cartoon Wars episode of South Park) and Stewie is hilarious. South Park is unlike any other tv show. Since that it takes less than a week to make, it can always take on current events and pop culture, it makes fun of EVERYBODY (it's neither left nor right-wing either), and Cartman is the most devious little character tv has ever seen. Futurama is a real interesting concept and Bender makes it very funny. What do u think