A server root access or root server gives you the full power to your own server with the maximum flexibility in setting up and configuring the web server.
Comparison of the service provider and server root access rates in the following area:
Root access of the server to the client is always in question, but to offer maximum freedom to clients a lot of web hosting companies offer this privilege. This step is practical as well, because whenever client wants to install his own scripts and don’t have patience to wait then giving them the server access usually is the right choice for the web host. In addition, administrator of the hosting company is able to obtain rights on your server and can make all the settings which you should opt for a root server.