Unstructured Data Storage Decision Tree

Choosing the right service involves weighing trade-offs across several dimensions. For scalability, all three handle large scale, but Data Lake Storage Gen2 is optimized for scaling out analytics jobs, while Cosmos DB scales for global transactional workloads. Access patterns are critical: Blob Storage's cool and archive tiers are perfect for long-term retention with rare access, Cosmos DB excels at constant, low-latency access, and Data Lake Storage Gen2 is built for high-speed analytical queries. Data organization differs: Blob Storage uses a flat namespace, Data Lake Storage Gen2 uses a hierarchical one for better management, and Cosmos DB uses databases and containers. For security, all offer encryption and access controls, but Data Lake Storage Gen2 and Cosmos DB offer deeper integration with Azure Active Directory for identity-based policies. Finally, cost structures vary significantly; you optimize Blob Storage costs by selecting the right tier, Data Lake Storage Gen2 costs are driven by transaction volume for analytics, and Cosmos DB costs are based on provisioned throughput and storage.