From Data to Viz in an online resouce designed to help the user in deciding on visualisation types and strategies appropriate to the type of data, including e.g. the possible needs for dissemination of complex issues.
It works through decicion trees presented on the main page.
As an extra help, each type of diagram is explained including pitfalls and caveats that should be taken into account for various visualisation approaches. (Bottom of main page, click type of diagram that ou are considering to use). To explore the advantages and limitations of specific types of visualisation better there is also a section on caveats, which serves as a library of more detailed information.