Couchbase has emerged as the clear leader in high-performance, general-purpose NoSQL databases, outperforming MongoDB and Cassandra DataStax in benchmark comparisons. The company's architecture was designed from the beginning to handle performance at scale with modern infrastructure, leveraging advances in memory and network technologies, whereas MongoDB and DataStax are struggling with architectural design flaws that hinder their ability to meet mission-critical deployment requirements. As the NoSQL market shifts towards phase 2, where high-performance is key, Couchbase's superiority becomes increasingly evident, making it an attractive option for enterprises looking to replace these databases with a more scalable solution.