A megacity is defined as a very large urban area, usually a metropolis, consisting of a main city supported by several satellite cities.
Le Corbusier's concept of urban planning envisions polished infrastructures (wide roads, clear sidewalks, spacious public facilities etc.) within cities with well-defined sectors (clear separation of residential and commercial areas).
A 'chaotic warm' approach is a city that looks “messy” from up above but feels 'warm' to its inhabitants: for example the presence of urban villages, city alleyways scattered with street food hawkers and hole-in-the-wall establishments.
For the purpose of this debate, both approaches would also aim for cleanliness, relative law and order and security albeit in different ways of delivering/implementing them.