Can't reply to @shorel, but of course Azure is running Linux servers. It has nothing to do with being tied to a Windows ecosystem.
Your choice to go with Azure probably has more to do with where you're getting value for cloud services, and where you started your project - in other words, how tied you are to the Azure ecosystem, or the AWS ecosystem as the case may be.
Your choice to go with Azure probably has more to do with where you're getting value for cloud services, and where you started your project - in other words, how tied you are to the Azure ecosystem, or the AWS ecosystem as the case may be.