AWS vs Azure: Where Each One Actually Wins

For most organisations the AWS versus Azure decision is not settled on technical capability, because both platforms are comprehensive. It is settled on identity, licensing and what the organisation already operates.

That is not a cop-out. Those factors have larger cost and delivery consequences than any individual service comparison.

Structure: account versus subscription

The organising models differ in a way that shapes everything downstream.

AWS makes the account the isolation boundary. Separation means separate accounts, organised under AWS Organizations, with Service Control Policies applying guardrails from above.

Azure separates identity from billing. An Entra ID tenant holds identity; subscriptions hold billing and quota; resource groups organise resources; management groups apply policy. A subscription can even be transferred between tenants.

Azure's model is more natural for organisations that already have a central directory. AWS's is cleaner when you want hard isolation with minimal shared state.

Identity is the decisive factor

If your organisation already runs Microsoft 365, identity already lives in Entra ID. Extending that into Azure is close to free: the same users, the same groups, the same conditional access policies, the same MFA enrolment.

Doing the same with AWS means federating Entra ID into IAM Identity Center. It works well and is a well-trodden path, but it is a thing you build and maintain rather than a thing you already have.

For organisations without a Microsoft directory, this advantage evaporates entirely, and AWS's larger talent pool becomes the more relevant factor.

Licensing: the largest hidden cost difference

Azure Hybrid Benefit lets organisations apply existing Windows Server and SQL Server licences with Software Assurance to Azure compute, removing the licence component from the hourly rate.

For a Windows-heavy estate this is not a rounding error. It can change the comparison decisively, and it has no equivalent on AWS. If you run substantial Windows Server or SQL Server workloads, model the licensed cost rather than the headline compute cost before concluding anything. An Azure account on a pay-as-you-go offer is the configuration that makes this benefit usable.

Hybrid and on-premises

Azure Arc extends Azure management to servers and Kubernetes clusters running anywhere, including other clouds. Azure Stack brings Azure services into your own data centre.

AWS Outposts places AWS hardware on-premises, and ECS/EKS Anywhere extend container orchestration. Both are credible, but Azure's hybrid story is more mature and more commonly deployed, largely because its customers more often have a substantial on-premises estate to bridge.

Compute and services

Day to day, the compute experiences are comparable. EC2 and Azure Virtual Machines cover the same ground. S3 and Blob Storage are equivalent in function. Lambda and Azure Functions both work well.

Differences that show up in practice:

• AWS has more instance families and a larger set of purpose-built accelerators.
• Azure has better first-party integration with Windows, Active Directory and the Microsoft developer toolchain.
• AWS has more regions and availability zones.
• Azure has broader sovereign-cloud options in specific jurisdictions.

Pricing

Both offer commitment discounts — Reserved Instances and Savings Plans on AWS, Reserved VM Instances and Savings Plans on Azure. Both offer interruptible capacity, Spot and Azure Spot respectively.

Azure's advantage is Hybrid Benefit. AWS's is a more mature Savings Plans model that applies flexibly across instance families and regions.

Neither is systematically cheaper. The variables that decide it are your licensing position, your ability to commit, and your egress volume.

Choosing

Choose Azure when identity already lives in Entra ID, when you hold Windows Server or SQL Server licensing, when hybrid is a genuine requirement, or when a sovereign region in a specific jurisdiction is mandated.

Choose AWS when you need the broadest catalogue, when your team's experience is already there, when you want the largest regional footprint, or when a specific service exists only there.

For a small Linux workload with no Microsoft dependency, neither is the obvious answer — a simpler provider usually is.

Frequently asked questions

Can I run Linux well on Azure? Yes. Linux is a first-class citizen and a large share of Azure workloads run on it. The Microsoft advantage is additive, not a restriction.

Is Entra ID the same as Active Directory? No. Entra ID is a cloud identity service; Active Directory Domain Services is the on-premises directory. They are related and frequently synchronised, but they are different systems with different capabilities.

Which has better support? Both sell tiered support with comparable structures. Quality depends far more on the tier purchased than on the vendor.

Does Hybrid Benefit apply to any Windows licence? No — it requires Software Assurance or an equivalent subscription. Confirm your entitlement before modelling savings.

Current configurations are listed on the Buy Azure Account and Buy AWS Account pages.