MinIO is best used when you need a self-hosted storage solution that can work with S3 API, giving you full control over your data. You would choose MinIO over Azure Blob Storage in scenarios where data sovereignty is critical, such as in financial applications that require sensitive data to stay within a specific geographic location.
Azure Blob Storage is ideal for scenarios requiring deep integration with other Azure services and enterprise-level features. For example, if your application needs to use Azure Functions, Data Lake, or advanced security controls like Azure Active Directory integration, Azure Blob Storage is a better choice. Additionally, its global reach can provide resilience and speed for a distributed user base.