Is there a list of pros-cons for deploying a PHP application on the cloud for AWS or Azure?
Which factors would make AWS a better choice over Azure and Vice-versa?
If anyone has chosen to use, either one instead of the other for a number or reasons I would really want to know why.
Is there a specific application you are talking about? I thnk choice will probably depend on the type of application and the cloud services required by the application.
This basically boils down to a windows vs linux discussion. For a PHP server environment, I'd normally advise a LAMP server setup (linux/apache/mysql/php) and azure is (as far as I know and expect from microsoft) windows-only. Unless you really need windows for some reason, a linux server performs better and is more stable than a windows server, at least for a php/apache setup, and is cheaper.
I have some AWS servers running CentOS at AWS for more than a year now, and never experienced problems.
Amazon has released the AWS SDK for PHP. http://github.com/amazonwebservices/aws-sdk-for-php