If you would like to host the sites or applications which are developed in PHP, perl and Mysql then you can host them in Linux server.
Linux servers are more secure compare to windows server. There are various in-built CMS like WordPress, Joomla, open cart and many more which are just one click installation.
If you will order the VPS then you will have root access. You can run any application supported by it as it will be your own server. You can manage the Linux VPS in your own ways.
Hope this information will help you.