The primary benefit of microservices in software architecture is their ability to enhance development speed and flexibility. Microservices architecture allows applications to be divided into smaller, independent services that can be developed, deployed, and scaled individually. This decoupling promotes continuous deployment, as teams can work on specific functionalities without impacting the entire application. Additionally, microservices improve system resilience and facilitate the use of different technologies or programming languages, ultimately leading to better maintainability and user experience.