Disneyland verses Magic Mountain...
Six Flags offer taller and faster coasters at the expense of the well crafted "artificial" experience that Disney offers. In city design, one would be like a giant round building complete with all the infrastructure, necessary stores and outlets, perhaps the epitimy of efficiency, whilst the other would be more like beautiful architecturally crafted buildings... complete with all the needs.
Either way, we need to envision a combination and a way to "grow" these planned spaces such that residents can enjoy, on a planet that otherwise would not be able to support tens of billions of people.
No cars (in the usual sense) needed, transport will be far more efficient, by use of vertical cable cars from say, 156th street "down" to the food store, walking and biking via pathways and even an occasional coaster. Being that hundreds of thousands of people could live comfortably in a single square mile (and highrise buildings), there would be no need for stop lights and congestion.
The two dimensional transport system of today shall be obsolete in Tomorrowland!