1. Cost Structure: MongoDB Atlas has a more flexible and cost-effective pricing structure compared to MongoLab. With MongoDB Atlas, users are able to choose from different instance types and sizes, allowing them to optimize their costs based on their specific needs. On the other hand, MongoLab has a fixed pricing structure with predefined plans, limiting flexibility.

2. Security: While both MongoDB Atlas and MongoLab offer security features, MongoDB Atlas comes with additional built-in security functionalities. It provides options for network isolation, IP whitelisting, and VPC peering, giving users more control over their data security. MongoLab, although it offers similar security measures, does not provide as extensive security options as MongoDB Atlas.

3. Scalability: MongoDB Atlas is designed to scale seamlessly as it automatically handles data distribution and sharding across multiple servers. This allows users to easily increase their storage capacity and handle larger workloads without significant performance impact. On the other hand, MongoLab has limitations on scalability as it does not offer the same automated scaling capabilities as MongoDB Atlas.

4. Managed Backups: MongoDB Atlas offers managed backups, allowing users to easily schedule and restore backups of their databases. Users can also choose between continuous backup or point-in-time recovery options to ensure data recoverability. MongoLab, on the other hand, does not provide the same level of managed backup services, requiring users to implement their own backup strategies.

5. Geographic Availability: MongoDB Atlas has a wider geographic availability compared to MongoLab, with data centers located in multiple regions around the world. This allows users to select the region closest to their target audience, reducing latency and improving overall performance. MongoLab, although it has multiple data centers, may not have the same extensive global coverage as MongoDB Atlas.

6. Integration with MongoDB Tools: MongoDB Atlas seamlessly integrates with other MongoDB tools, such as MongoDB Compass and MongoDB Charts, providing users with a more unified and streamlined experience. Users can easily visualize and analyze data stored in MongoDB Atlas using these tools. MongoLab, although compatible with MongoDB tools, may not have the same level of integration and compatibility.

In Summary, MongoDB Atlas offers a more flexible cost structure, enhanced security options, seamless scalability, managed backups, wider geographic availability, and better integration with MongoDB tools compared to MongoLab.