The cable one basically has the control electronics mounted in the plug. If you are looking for a preoffesional device, d go for the pro, personally because i have one and use it ALOT, it has never caused me problems, even when my computer crashed it just kept going and going. As for software, take a look for JS_DMX, it will control the DMX Usb pro, nd will give you enough sliders for most purposes. DMX is just and adressing protocol designed for DJ's, and some theatres. A few theatres still use the old type of lighting control, cant remember the name right now.