Mostly ease of parsing. JSON is easy to parse from vanilla javascript without frameworks. The same applies to PHP. Parsing complex XML is a major hassle.
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jsonfeed.org is an up-and-coming new pull format that seems better than anything XML-based. :)
Better how?
Mostly ease of parsing. JSON is easy to parse from vanilla javascript without frameworks. The same applies to PHP. Parsing complex XML is a major hassle.