If it were just adults, I would say Epcot, cause you can drink at Epcot, you can't drink at MK.
Although depending on the age of your teens, ask them which rides they like better. They may prefer Mission Space, Test Track, Soarin, or they may prefer Big Thunder, Splash Mountain, Space Mountain, Buzz.
We arent' going to be down there at all, so take my advice with a grain of salt.