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XSL is used to refer to a family of languages used to transform and render XML documents. CSS is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. Hence XSL and CSS are not the same and not interchangeable.
Let's compare XML and JSON on the attributes that the XML community considers important. From http://www.simonstl.com/articles/whyxml.htm. XML is simpler than SGML, but JSON is much simpler than XML. JSON has a much smaller grammar and maps more directly onto the data structures used in modern programming languages. JSON is not extensible because it does not need to be.