Azure Virtual Machine vs Azure Web App

Azure Virtual Machine

Azure Web App

Description

Infrastructure as a service, if you need to have full control over your computing environment.

Platform as a service, it allows you to integrate the app without managing the underlying infrastructure.

Deploy

Uses an OS image.

Uses a runtime stack.

State Management

Stateful or stateless

Stateless

Autoscaling

You need to use VM scale sets to support autoscaling in virtual machines.

Autoscaling is a built-in service in App Service.

Scale Limit

1000 nodes per scale set for platform image and 600 nodes per scale set for custom image

20 instances and 100 with App Service Environment

Traffic Distribution

Distribute the incoming network traffic using Azure load balancer.

Load balancing is integrated into App Service.

Architecture Styles

The supported architecture styles are N-Tier and Web-Queue-Worker.

The supported architecture styles are N-Tier and Big compute (HPC).

 

Sources:
https://docs.microsoft.com/en-us/azure/app-service/overview
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/overview
https://docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/compute-decision-tree

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