When I sudo, then there is no vimrc for sudo on my pc. So I know how the difference is between with or without. I set it to myself this way.

• advantages: You learn to use vim and its original key bindings, which can be handy in case you cannot use your own config. Learning stuff in the web makes it easier to adapt, as some of the settings in vimrc can make it incompatible to use them straight away.
• disadvantage: If you are used to specific key bindings doing stuff, then you might miss them. No customization to your needs, which is the entire point of such a config file. There are many useful features and settings, sometimes specific to filetypes or to your personal habbits.