Yeah, I don't know the difference either, but I'm using the GL/2 driver I think because I had some printing issue way back when and just changed the driver and some settings looking for a solution and it worked and I was back up and printing again. Changing to the GL/2 driver may or may not have been "the fix." And that's why I'm always paranoid about firmware / driver updates, changes. If it's working, I've learned sometimes it's best to not tinker with it.
If I didn't have a customer who wants some prints done on this Ilford Gold baryta paper I probably would leave it alone. I'm trying to get all of my jobs cleared through so if something goes wrong updating driver / firmware I'll have enough time to work on it and get it all back online.