The superbit has a higher bit rate than standard DVDs. If you have a DVD player that can display the bit rate, you will notice that most DVDs change the bit rate during the picture. Scenes with a lot of motion require higher bit rates. Lower bit rates allow more movie time on the same disc. Sony has made these "superbit" DVDs with significantly higher bit rates, but have left out other bit using features such as director commentary or trailers or the making of the movie and instead have opted to give a really great picture and in most cases have added DTS sound (although I understand it is compressed slightly more than usual to fit with the superbit bandwidth). I definitely notice a difference in the superbit vs the conventional disc, but it's not a huge difference. Better color saturation and better 3D characteristics are the most noticable benefits. I don't really ever watch many of the "extras" that have been cut out of the superbit version, so for me the decision is pretty simple.
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