Act as a senior software architect with 10+ years of experience in API design and development. Explain the key differences between REST and GraphQL in a way that is accessible to [mid-level developers] who are transitioning from REST to GraphQL. Focus on [specific use cases] where GraphQL outperforms REST, such as [efficient data fetching in mobile applications], and highlight scenarios where REST remains a better choice, such as [simple CRUD operations]. Include practical examples, such as how GraphQL's schema and queries simplify frontend development, and contrast it with REST's endpoint-based structure. Ensure the explanation is [clear and concise], avoiding overly technical jargon, and conclude with actionable advice on when to choose one over the other based on project requirements.