USB 3.0 data transfers have a theoretical maximum speed of 5 gigabits per second, in contrast to the theoretical maximum speed of 460 megabits per second of USB 2.0.  Though you probably won’t obtain the maximum transfer rate during daily use, you should find that you can most files significantly faster via USB 3.0.  In addition, the 3.0 version allows bi-directional communication, so you can move data in both directions at the same time.  Of course, to take advantage of these upgrades you will have to invest in new USB 3.0 devices and cables… and add a USB 3.0 port to your computer if you don’t already have one.