TiDB and Vearch are two different approaches to vector search in distributed database systems, catering to distinct use cases. TiDB is a distributed SQL database that offers hybrid transactional and analytical processing (HTAP) capabilities, making it suitable for companies already using MySQL who want to add vector search while keeping ACID compliance. Vearch, on the other hand, is a tool specifically designed for high-performance vector similarity searches, ideal for AI-focused applications like image similarity search engines, recommendation systems, or natural language processing applications. When choosing between TiDB and Vearch, it's essential to evaluate your specific needs and consider factors such as search performance, data management, scalability, integration, setup, and maintenance costs, as well as the type of database operations required. Thorough benchmarking with your own datasets and query patterns will be key to making an informed decision between these two powerful but different approaches.