Couchbase and Rockset are both distributed databases with vector search capabilities, but they differ in their approach to handling vector data and their primary use cases. Couchbase is a flexible general-purpose NoSQL database that allows developers to implement custom vector search within a familiar environment. It's great for applications that need to balance traditional database operations with vector search and can handle diverse data types, including JSON documents. On the other hand, Rockset is designed for real-time search and analytics applications that require immediate insights from rapidly changing data. Its Converged Indexing and high-dimensional vectors make it a good choice for applications that need to process high velocity data streams and frequent updates to vector embeddings. When choosing between Couchbase and Rockset, consider your use cases, data types, performance requirements, existing infrastructure, development team's expertise, and the type of data (static vs streaming).