When it comes to managed dedicated servers, you must know that this is a form of Internet hosting wherein a site owner leases the whole server and does not need to share it with other people. The benefit of having this type of server is that the owner can choose which hardware and operating system to use for the site. Moreover, the hosting company often provides server administration for the owner so that they don't need to get a third party involved. If you are looking to invest in a server, this would be more ideal since it is more economic. You won't need to shell out too much money on a monthly basis.
The Dedicated Server Handbook (Linux Edition)