1. Deployment Method: DataStax Constellation is a cloud-native DBaaS platform, providing effortless deployment and scaling in the cloud, whereas DataStax Enterprise is an on-premise database management solution that requires manual deployment and configuration on local servers.

2. Pricing Model: DataStax Constellation follows a pay-as-you-go model, allowing users to pay for the resources they consume on a monthly basis, while DataStax Enterprise involves a one-time licensing fee for the software and additional costs for support and maintenance.

3. Scalability: DataStax Constellation enables seamless horizontal scaling by automatically adding nodes to distribute the workload, whereas DataStax Enterprise requires manual intervention and configuration to scale the database horizontally.

4. Maintenance and Updates: DataStax Constellation handles maintenance, upgrades, and patches automatically behind the scenes, ensuring the system's health and performance, whereas DataStax Enterprise demands manual effort to schedule and implement maintenance tasks, updates, and patches for the database.

5. Managed Services: DataStax Constellation offers managed services such as backups, monitoring, and security features as part of its package, relieving users of the operational burdens, while DataStax Enterprise necessitates users to set up and manage these services separately or through third-party tools.

6. Support: DataStax Constellation provides round-the-clock technical support and assistance for any issues or questions users encounter, offering a higher level of support compared to DataStax Enterprise, where support options may vary based on the chosen subscription tier.

In Summary, DataStax Constellation and DataStax Enterprise differ in deployment method, pricing model, scalability, maintenance and updates process, managed services, and level of support provided.