1. Data Source Connections: Amazon Quicksight provides a wide range of data source connections including AWS services, on-premises databases, and SaaS applications. Cluvio focuses on direct integrations with databases like PostgreSQL, MySQL, and Redshift, offering less variety but stronger connectivity options. Metabase also supports multiple data sources, but users may need to use SQL queries to connect to some databases that are not directly integrated.

2. Visualization Capabilities: Amazon Quicksight offers beautiful, interactive visuals with features like AutoGraph and ML Insights. Cluvio provides customizable dashboards and extensive charting options, but may lack advanced ML capabilities compared to Quicksight. Metabase offers basic chart types and customization options but may not be as visually appealing as the other two platforms.

3. Scalability and Performance: Amazon Quicksight is tightly integrated with AWS, providing scalability and performance for large datasets and complex queries. Cluvio is suitable for medium-sized datasets and offers real-time analytics capabilities, but may not scale as seamlessly as Quicksight. Metabase may face performance issues with very large datasets and intensive queries due to its open-source nature.

4. Cost Structure: Amazon Quicksight has a pay-per-session pricing model, which can be cost-effective for organizations with varying user numbers. Cluvio offers pricing based on active users and storage, making it suitable for teams with consistent usage patterns. Metabase is free to use, which is ideal for small organizations or projects with budget constraints.

5. Collaboration and Sharing Features: Amazon Quicksight allows sharing and collaboration within the platform and also integrates with other AWS services for seamless teamwork. Cluvio offers collaboration features like sharing dashboards and reports with team members, but may not have the same level of integration with external tools. Metabase supports sharing and embedding dashboards but may lack advanced collaboration features compared to the other two platforms.

6. Ease of Use and Learning Curve: Amazon Quicksight has a user-friendly interface with drag-and-drop functionality, making it easy for non-technical users to create visualizations. Cluvio offers a straightforward interface for creating queries and dashboards, but users may need some SQL knowledge for advanced features. Metabase has a simple setup process and interface, but users may face a steeper learning curve when customizing dashboards or using more complex features.

In Summary, Amazon Quicksight, Cluvio, and Metabase offer distinct features and functionalities in terms of data source connections, visualization capabilities, scalability, cost structure, collaboration features, and ease of use.