JSON is structured (not plain text to be analyzed by an IA).
JSON has JSON Schema.
In addition, JSON is easier to parse and to map to common data structures of programming languages.
In addition, JSON is easier to parse and to map to common data structures of programming languages.
I'm also not so sure about JSON being easier to map to common data structures. The lack of order guarantees within objects makes things like ordered maps quite annoying (you need to either use an array of entries with key and value, or an index within the mapped objects).
JSON is not, it is closer to the PHP, JS, etc "object" type, which is an ephemeral object with arbitrary member associations.
And, to be clear, this is not a value judgement. They just excel in different fields. XML tends to be easier for strongly and strictly typed languages such as C/C++, C#, Java, etc where you can use the schema to generate your structs automatically. Vanilla JSON is easier for higher level languages that don't require you to manually create a mapping/validation level. JSON Schema tries to bridge that gap to a degree, but isn't built into the standard and isn't even universal.
But, ultimately, both are perfectly sufficient for either use case. It just depends on how much massaging you want to do to make them work.