AWS vs. Azure: A Practical Cloud Provider Comparison

Choosing a cloud provider is one of the more consequential infrastructure decisions a team makes — and it rarely stays simple. AWS and Microsoft Azure together hold over half of the global cloud market, and both have been expanding their service catalogs at a rapid pace since AWS launched in 2002 and Azure followed in 2008.

The honest answer is that both platforms offer comparable capabilities across most categories. The differences that matter tend to be specific to your workloads, your team’s existing expertise, and your organization’s existing vendor relationships. This post walks through four areas where meaningful differences exist.

Networking

AWS: Virtual Private Cloud (VPC) Azure: Virtual Network (VNet)

Both providers require a virtual network before any compute resources can be deployed, and both support subnets, internal DNS, firewalls, and network peering. The most notable structural difference is address space: Azure supports networks with up to 16.7 million addresses, while AWS caps VPCs at 65,536. For organizations with dense or complex network architectures, that gap matters.

DDoS protection is available on both platforms at roughly similar pricing — around $3,000 per month for the managed service tier. AWS includes a free standard tier that provides automatic baseline protection for all resources without any configuration required.

Compute

AWS: Elastic Compute Cloud (EC2) Azure: Virtual Machines

Virtual machines are a commodity on both platforms. Both offer dozens of instance families ranging from minimal single-vCPU configurations to instances with hundreds of cores and terabytes of memory. Both maintain a marketplace of pre-built images, and pricing follows similar models — pay by the hour, stop paying when the instance is off, with significant discounts available for one- or three-year reservations (often 60–80% off on-demand rates).

The one area where AWS has a clear advantage for experimentation is the Free Tier. AWS offers micro-instance EC2 time at no cost, which is useful for testing or running small workloads. Azure has a limited free trial but no equivalent ongoing free compute tier.

Active Directory

AWS: Directory Service Azure: AD Domain Services and Microsoft Entra ID

This is one of the more meaningful differences between the two platforms, largely because Microsoft owns Active Directory.

Azure offers AD as a true managed service — the underlying servers, OS, and software are fully abstracted away. You manage the directory itself, not the infrastructure running it. AWS takes a different approach: Directory Service provisions actual EC2 instances with the necessary software installed, which means ongoing responsibility for the OS and software patching.

Pricing reflects this tradeoff. AWS is slightly cheaper at roughly $0.12 per hour for a standard directory, compared to Azure at approximately $0.15 per hour. For teams already invested in Microsoft’s ecosystem, the managed nature of Azure’s offering often outweighs the cost difference.

Azure also includes Microsoft Entra ID (formerly Azure AD) with every account at no base cost. It’s a cloud-native identity service — not a full Active Directory replacement — but it handles user authentication, application access, and integration with Azure services well, with options to upgrade for advanced features on a per-user basis.

SQL Server

AWS: Relational Database Service (RDS) Azure: SQL Database and SQL Managed Instance

Microsoft’s ownership of SQL Server gives Azure a structural advantage here. Both platforms offer fully managed SQL Server hosting, but Azure consistently has access to the latest SQL Server versions first. AWS supports multiple versions, which is useful for compatibility-constrained workloads, but may lag on the newest releases.

Both platforms include built-in high availability through replication — multi-AZ in AWS and geo-replication in Azure. In both cases, a synchronized standby database can be promoted automatically or manually if the primary fails. This adds cost since you’re running multiple database instances, but for production workloads the durability benefit is generally worth it.

For organizations heavily standardized on SQL Server and Microsoft licensing, Azure’s tighter integration and licensing portability (particularly for Software Assurance customers) can represent meaningful cost savings.

Closing Thoughts

Neither platform is universally superior — the right choice depends on the specifics. AWS tends to have a broader service catalog and stronger free-tier offerings for experimentation. Azure tends to be the better fit when an organization is already deep in the Microsoft ecosystem, particularly for identity and SQL Server workloads.