Apache Cassandra and Rockset are two popular options for handling vector data in AI applications. Both databases have their strengths, with Cassandra excelling in managing large-scale distributed data and offering high availability, fault tolerance, and scalability across multiple data centers. On the other hand, Rockset shines in real-time search and analytics scenarios, supporting quick ingestion and indexing of high-velocity data streams, in-place updates, and flexible vector search capabilities through its Converged Indexing technology. The choice between these technologies should be driven by specific project requirements, such as the scale of data distribution needed, the importance of real-time processing, the complexity of vector operations required, and how vector search fits into the overall data architecture of the application.