ProVideoPlayer 1 supported DMX over USB using a device from ENTTEC. This was used primarily because it was a simple way to implement DMX support for an existing product. There were a number of stability issues with this device that made it difficult to use for some people.
When we released ProPresenter 5 we included DMX over ArtNet as part of the Communications Module and chose to use ArtNet for PVP 2 as well. ArtNet is widely available in many standard consoles used in churches, theaters, and the touring industry. It is also a very mature protocol which means it is quite stable. Since ArtNet runs over Ethernet, it does not require additional components to connect PVP 2 to a system that is using ArtNet.