As technology is always changing, especially software, trying to accurately compare two different database vendors is fraught with dangers. Each vendor is releasing new versions of their product. In a number of cases, a direct comparison of any two features might be an invalid comparison because of the core differences in the architecture between them.
The following scale highlights a personal observation based on the capabilities for managing unstructured data within the database. Though Oracle is a long way ahead of other vendors, there is still a lot it can do to enhance and improve the database to support unstructured data. Refer to the following diagram: