The primary benefit of using an agile development methodology is its emphasis on flexibility and iterative progress. Agile promotes adaptive planning, evolutionary development, and continual improvement, allowing teams to respond to changing requirements and feedback quickly. This approach enhances collaboration among team members and stakeholders, ensuring that the final product aligns more closely with user needs. Additionally, agile practices, such as sprints and regular stand-up meetings, foster a culture of continual feedback and improvement, ultimately leading to higher quality software delivered in shorter cycles.