TiDB and Neo4j are two distinct vector databases designed to serve different use cases. TiDB is a traditional database that offers hybrid transactional and analytical processing capabilities, distributed scalability, and MySQL compatibility, making it suitable for applications that combine vector search with SQL queries or integrate vector operations into existing MySQL-compatible environments. In contrast, Neo4j is a graph database that excels in graph-based applications, providing native vector indexing and integration with graph queries, ideal for AI-powered applications like recommendation systems, knowledge graphs, or fraud detection systems. When choosing between these two options, it's essential to evaluate your use case, data types, workload patterns, and performance requirements to decide whether TiDB's robust distributed SQL capabilities with vector search or Neo4j's graph-based architecture with native vector indexing is the better fit for your needs.