you asked for the party line but imma give own anecdotes since ive been there muhaahahahaha

• there's practically no homelessness. the lack of abject poverty also means there isn't much petty crime.
• healthcare is dirt cheap and super efficient (i got kidney stones and pneumonia when i was there and i just walked into a hospital and got world class care pretty much immediately)
• the public transit is probably the best in the entire world
• the cities are really clean, well planned, and full of trees. residential blocks instead of urban sprawl ensure the cities don't have to take up a lot space while still being able to house large populations. so, more space for nature. shenzhen has a reputation for being a cyperpunk city cuz of how it looks at night, but it actually sits in the middle of a big mangrove forest, and the city itself is covered in greenery.
• the social scene is very vibrant because capitalism didn't get to destroy third places like it did in crackerland. muh private property isn't taken very seriously so you can hang out pretty much anywhere, streets prioritize humans and bikes over cars (drivers have to go pretty slow in a lot of places 'cause of all the street markets and stuff).
• all the cities have bike lanes and there are probably more people on electric scooters than cars (which are also almost entirely electric)

there's a lot more to talk about but this is already getting pretty long, so yeah china is pretty cool