1. Data Modeling: PlayFab provides a NoSQL database approach, allowing for flexible data modeling where data can be stored in a schema-less format. In contrast, Supabase uses a relational database approach, providing structured data modeling based on tables, columns, and relationships.

2. Real-time Data Sync: PlayFab offers real-time data sync through its LiveOps feature, which allows for updating and syncing player data across all connected devices instantly. On the other hand, Supabase focuses on real-time data through WebSocket connections, enabling automated updates to clients when changes occur in the database.

3. User Authentication: PlayFab offers user authentication through various identity providers such as Facebook, Google, and custom authentication options. Supabase, however, emphasizes user authentication through OAuth providers like Google and GitHub, ensuring secure login functionalities.

4. Data Storage: PlayFab integrates with Azure Blob Storage for efficient data storage solutions, facilitating secure and scalable data handling. In contrast, Supabase leverages Postgres for data storage, providing robust transaction capabilities and data integrity.

5. Serverless Functions: PlayFab supports serverless functions through Azure Functions, enabling developers to execute custom logic in response to game events. Meanwhile, Supabase allows for serverless functions using JavaScript and PostgreSQL triggers, offering seamless execution of backend logic.

6. SDK Support: PlayFab offers SDKs for various platforms like Unity, Unreal Engine, and others, ensuring easy integration and development for game projects. Conversely, Supabase provides SDKs for popular frontend frameworks like React and Vue.js, simplifying client-side interactions with the database.

In Summary, PlayFab focuses on NoSQL database modeling, real-time data sync, and Azure integration, while Supabase emphasizes relational database modeling, WebSocket connections, and Postgres integration for streamlined development processes.