Couchbase Capella, a cloud-agnostic, fully managed database service, was evaluated against Azure CosmosDB in a performance study conducted by Altoros using the Yahoo! Cloud Serving Benchmark. The comparison focused on latency and throughput across various workloads on different cluster configurations, showcasing Capella's superior performance in all scenarios. Capella excelled in handling update-heavy, scan-intensive, pagination, and JOIN operations, demonstrating high throughput and consistent low latency as cluster sizes increased, unlike CosmosDB which experienced failed requests and lower throughput. Capella's features, such as SQL-based query support and cloud flexibility, were highlighted as advantages over CosmosDB, which is limited to Microsoft's Azure platform. The study concluded that Capella offers unparalleled speed, reliability, scalability, and flexibility, with additional Couchbase services like Eventing and Analytics, while maintaining a lower transaction cost.