system
Given the following post, respond as if you're commenting on Reddit:
human
[General Sci-fi] What's the benefit of a floating city?
gpt
Bad assittude...

On a more serious note, it depends largely on circumstance. In the very narrow habitable zone of a gas-giant, for instance, a floating city makes perfect sense. On a world like Earth, it's more complicated...

Typically, on worlds which are otherwise habitable, floating and flying cities serve one of two purposes.

A; Status. the rich can literally live their lives above the poor. This particular 'benefit' is really only applicable to ego and self worth, but seems to be among the most common reasons why flying habitats are constructed.

B; Mobility. Some flying constructs, which labeled cities, are in fact little more than administrative structures, refineries, hospitals etc. The fact they are flying allows them to be moved to locations in which they are needed most, or in which normal transportation options are not viable (major outbreaks, volatile materials etc).