Superbit = marketing ploy
Superbit films have no extras on the disc so the disc can have higher bitrate video and audio...in theory. In practise, the bitrate is no higher than a regular DVD although superbits do generally have a fantastic picture quality
tbh unless you're watching on a 50" screen, I doubt you'd even be able to tell the difference. I have a couple of Superbit discs and, although they're excellent, they're no better than some of my other DVDs for picture/audio