Which is better, XML or JSON, for SerializedLOB?

Question

MySQL

Let's say there is a Real Estate Catalog (or a catalog of goods, we have these tools). If the attributes of objects / goods of goods are stored in SerializedLOB (this is a pattern called so by Fowler, i.e. a serialized object), then what do you think is more suitable in this case, XML or JSON? (i.e. part of the data is normalized, and there is the main table "objects" / "products", but the individual attributes are placed in a separate field, in the form of a serialized object). Interested in MySQL.
1. XML. Attractive next.
a) There is XQuery, XPath. No need to reinvent the wheel, just form XPath queries. (However, the thing is rather slow...)
b) In SQL2006, the functionality of working with XML has been extended, it also involves inserting queries to XML directly in the SQL query.
2. JSON
a) More concise
b) MySQL should soon have functions for working with JSON. Serialize to binary format, work fast.

Answer 1

Why is there no option to serialize objects? If you need to store objects, then I would prefer JSON serialization

Answer 2

json is more versatile and faster to parse.