There are number of plugging tools available for monitoring network devices. If you want to monitor Windows servers the most popular is System Center Operations Manager. Nagios is popular too. They may not be the best tool but they are cheap or free.
If your focus is on application hosting (Wordpress, drupal, SugarCRM, etc) you may want to check out Bitnami Cloud hosting, which provides a 'Human Friendly' interface on top EC2 for deploying the apps and after that provides automatic monitoring and backups, resizing and many other capabilities.
This actually depends on your work environment that decides your prior requirement to go with VPS or PAAS. The VPS server management services provide all necessary assistance related to VPS management and development. VPS or PAAS 1. You need to ask yourself, if you have a dedicated server admin who could take care of your...
Apart from AWS and Microsoft that basically handles IaaS (Infrastructure as a Service). Google Cloud platform is a cross platform cloud Monitoring tool that can be used for Cloud Deployment too. So, it provides with IaaS + PaaS features too. As concerned with AWS Cloud integrations, there are many tools at your doorstep to integrate with both AWS and Azure.
Pingdom does availability monitoring by providing synthetic checks against technology. This is a foundational building block of monitoring but is not a comprehensive monitoring strategy which requires availability, performance and diagnostic capabilities. Increasingly the discovery and capture of distributed transactions is becoming the difference maker in monitoring today. Alternatives to Pingdom 1.
By best WordPress hosting, you means something different for different sorts of websites, and the majority of WordPress sites are a bad fit for WP Engine and are better off with shared hosting, like Bluehost or Dreamhost, or letting Wordpress host them. There are approximately 72MM wordPress sites globally and many more created every day.
You have got a bunch of options out there for in depth monitoring of node. There used to be some clean play products out there, but maximum of them have disappeared away. Node.js is normally used as part of an application, hence you normally have other application languages to manage and monitor.
Each sever operating system is assigned for a particular type of work and it actually depends on the developers choice to select the server best suited for his work. There may variation in selection process but the task performance must be specified as per the requirements.
There are two different questions here, so the way of dealing will be different for security and stability. Linux server security management system and Linux server management support services provides all care and assistance for better security and stability. Regarding Security: OSX is proprietary- it means you can't review the source code.