This article is pretty garbage. compares almost nothing about xml and instead compares the tooling around xml giving no thought to the tooling around json.

instead, let me give you my unsolicited opinion:

if you need to represent both the structure of your data and characteristics within that structure, xml is great because attributes are a really good way to do that. there's a reason most UIs are represented as XML.

if your data is just - well, data - use json. or better yet use edn