I agree with bdjsiqoocwk that XML is way simpler than SQLite. In the case where I'm making changes by hand, it's much easier to open an XML file in a text editor and edit it, than it is to figure out an SQL query to do the same thing. In the case where I'm making changes programmatically, libraries will handle the complexity of XML for me, but I will still have to struggle through figuring out an SQL query if I'm trying to connect to SQLite.

SQLite is easier if you're comfortable with SQL to the extent that it's little to no effort for you to write queries. But most people aren't that comfortable, and XML offers them significant advantages. I certainly prefer XML at any rate.