Both Network license types are offer to users and both do have certain advantages and disadvantages. Here are some of the main differences:
i. Requires a USB port on the server – Not all servers have this especially if they are in a server rack with thin servers.
ii. Users cannot check out licenses from the dongle to use remotely for a certain amount of time.
i. Little more time to get setup and usually requires interaction with an IT admin to gather information to generate a license and activate.
ii. If server hardware changes constantly, then the license may need to be recreated more often where as a dongle this is not required.
Attached are documents for both with installation instructions so that you have an idea about the steps. The support team is capable of working with you to get either installed and used.