Favorite Speed Test Systems

For many years we have had a local instance of the Ookla speedtest.net on our network, and while it is pretty good some other tests seem include more detailed results. I am aware of the following speedtest systems that an operator can likely have a local instance of: * Speedtest.net * Sourceforge.net/speedtest * Dslreports.com/speedtest Are there others? What is your preferred one and why? Thanks, Graham