When comparing CDNsun vs Microsoft Azure, the Slant community recommends Microsoft Azure for most people. In the question“What are the best content delivery networks (CDNs)?” Microsoft Azure is ranked 10th while CDNsun is ranked 18th. The most important reason people chose Microsoft Azure is:
Most, if not all, of the major cloud PaaS providers offer a Linux variant to host your applications. Windows Azure, being a Microsoft product obviously, supports Windows in addition to Linux.
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Pros
Pro HTTP/2 Support
Supports HTTP/2 ON SSL connections
Pro Good help section with useful examples on
Pro Detailed statistics
Pro Highly configurable
Pro Supports running Windows Server
Most, if not all, of the major cloud PaaS providers offer a Linux variant to host your applications. Windows Azure, being a Microsoft product obviously, supports Windows in addition to Linux.
Pro Linux Instances
The Azure platform has been supporting Linux VMs for a while now and has Linux distributions readily available in the catalogue.
Pro Free Tier
Microsoft Azure offers a Free Tier option that allows you to spawn a BST-1 instance that has 750 free hours.
Cons
Con It's a bit hard to use a Let's Encrypt certificate
It only lets you to use Let's Encrypt with Push, and to use it with Pull you need to create one manually from your computer.
Con Expensive
Even though in the context of Pay-as-you-go services, it's cost effective, but monthly pricing for these services are quite higher than competitors.