What’s better for shared app files, AWS EFS or Azure Files?

If you mean shared app files for multiple VMs/containers in the cloud, there isn’t a universal winner — AWS EFS and Azure Files are both solid, but they fit different setups better.

Quick answer

• Choose AWS EFS if you’re on AWS and want:
  • native Linux/NFS shared storage
  • automatic scaling
  • strong fit for containerized apps and AWS services
• Choose Azure Files if you’re on Azure and want:
  • SMB and NFS options
  • easy Windows file share integration
  • simpler compatibility with Windows apps and lift-and-shift file shares

Main differences

AWS EFS

Best for: Linux workloads, Kubernetes/ECS/EKS, distributed apps

Pros

• Fully managed, elastic file system
• NFS-based, good for Linux
• Scales automatically without pre-provisioning capacity
• Works well with AWS-native services
• Supports multiple mount targets across AZs

Cons

• Usually not the best choice for Windows SMB workloads
• Can be more expensive than expected for small/idle use cases
• Latency/performance may not match local disk for I/O-heavy apps

Azure Files

Best for: Windows apps, SMB shares, hybrid/migrated file shares, Azure-native apps

Pros

• Supports SMB, which is great for Windows compatibility
• Also offers NFS tiers for Linux in some scenarios
• Easy for lift-and-shift apps that already expect a network drive
• Good integration with Azure services and identity options
• Often simpler for traditional file-share semantics

Cons

• Performance and feature set depend heavily on the tier
• SMB performance and locking behavior may affect some apps
• Can be less ideal than EFS for Linux-first cloud-native apps, depending on design

Rule of thumb

• Linux + AWS + cloud-native app → EFS
• Windows + Azure + shared drive behavior → Azure Files
• Need SMB specifically → Azure Files
• Need highly elastic NFS shared storage in AWS → EFS

Important factors to compare

When deciding, look at:

• OS compatibility: Linux/NFS vs Windows/SMB
• Performance needs: throughput, latency, metadata-heavy workloads
• Scaling model: elastic vs provisioned
• Security/integration: IAM, AD, identity, encryption
• Cost: storage, throughput, transactions, snapshots, backups
• Deployment model: VMs, containers, hybrid access

Practical recommendation

• For new cloud-native shared storage, pick the platform-native option:
  • AWS → EFS
  • Azure → Azure Files
• If your workload is Windows file-share oriented, lean Azure Files
• If your workload is Linux file-share oriented, lean EFS

If you want, I can also give you a feature-by-feature comparison table or recommend one based on your specific app type (Windows, Linux, Kubernetes, static uploads, media processing, etc.).