1. Template Language: Statamic utilizes Antlers as its template language, offering a flexible and easy-to-use syntax for building templates. On the other hand, Tumbless uses Twig as its templating engine, providing a robust and widely-used approach to creating templates.

2. Licensing Model: Statamic follows a traditional licensing model where users pay for a license based on the number of sites they need. In contrast, Tumbless is an open-source platform, allowing users to use and modify the software freely without any licensing fees.

3. Content Structure: Statamic uses a file-based approach for storing content, making it easier to manage version control and collaborate on content. Tumbless employs a database-centric model for content storage, offering more robust querying capabilities and scalability for large sites.

4. Extensibility: Statamic has an active marketplace offering add-ons and themes developed by the community, providing users with a wide range of options to enhance their site's functionality. Tumbless has a growing ecosystem of plugins and extensions that can be easily integrated to extend its core features.

5. User Interface: Statamic provides a user-friendly control panel that allows non-technical users to manage content and settings easily. Tumbless offers a simple and intuitive interface, focusing on minimalism and user experience.

6. Learning Curve: Statamic is known for its simplicity and ease of use, making it a great choice for beginners or users with limited technical knowledge. Tumbless has a steeper learning curve, requiring users to have a basic understanding of its templating language and functionality.

In Summary, Statamic and Tumbless differ in their template language, licensing model, content structure, extensibility, user interface, and learning curve.