More wealth. More collective resources. More convenience. More people. More social mobility. More education. More life options. More third places. More public transportation...
Unless you're in a car-centric society that went out and flattened all of the wild spaces and fertile lands in order to develop some shitty suburbs that drain the wealth of the local cities as they try to keep alive a collective of people who decided they hate humanity* and don't want to be around them, but refuse to give up the conveniences of a city. As a result the cities can't develop and maintain a working public transportation system because all of its infrastructure goes to the convenience of car-driving suburb dwellers who all hate the city anyway.
*Okay. They don't hate humanity. They hate the brown-skinned and accent-having people who usually live in cities. Let's not tell lies about the real motivation behind the development of the suburb in the 20th century.