Hi
It seems that the REST API provides a high number of features through HTTP. I'm interested to know of some scenarios where we will rather use the QueryBuilder Java API over the OOB Rest API (querybuilder.json)
QUeryBuilder is a better solution to use if you want to build logic in a custom OSGi service - which is implemented as Java. When you say Restful OOTB - I assume you are talking about the default SlingPostServlet.
If you want to learn about how to use QueryBuilder API within an OSGI - see:
https://helpx.adobe.com/experience-manager/using/using-query-builder-api1.html
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