1. Pricing Model: Azure Database for PostgreSQL follows a pay-as-you-go pricing model based on resources consumed, whereas ElephantSQL offers a fixed pricing structure based on the plan selected, which may be more predictable for budgeting purposes.
2. Managed Services: Azure Database for PostgreSQL is a fully managed service provided by Microsoft, offering automated backups, scaling, and maintenance, whereas ElephantSQL also provides managed services but may require more manual configurations for certain tasks.
3. Integration with Azure Services: Azure Database for PostgreSQL seamlessly integrates with other Azure services for a comprehensive cloud solution, while ElephantSQL may not have the same level of integration capabilities with external services outside of its platform.
4. Customization Options: Azure Database for PostgreSQL provides more flexibility and customization options for configurations and settings, accommodating specific database requirements, whereas ElephantSQL may have more limitations in terms of customization due to its fixed plans and offerings.
5. Security Features: Azure Database for PostgreSQL offers advanced security features such as encryption at rest and in transit, advanced threat protection, and role-based access control, whereas ElephantSQL may have fewer security features by comparison, potentially requiring additional security measures to be implemented by the user.
6. Scalability: Azure Database for PostgreSQL offers horizontal scaling options with flexible server configurations to accommodate varying workloads and demand, while ElephantSQL may have limited scalability options depending on the selected plan, potentially leading to performance limitations in high-volume scenarios.

In Summary, Azure Database for PostgreSQL and ElephantSQL differ in pricing models, managed services, integration capabilities, customization options, security features, and scalability, catering to different needs and preferences in database management.