Apple iTunes graps another victory in public listening comparison, featuring MPEG-4 AAC codecs at 128kbps bitrate. The Nero AAC codec is statistically considered to be equally good, even though there is a clear difference in the diagram. Real, FAAC and Compaact! come after the winning couple. The biggest surprise in the results might be the decent rating of the open-source encoder FAAC, which has improved a lot in terms of quality.
Read the full results with commentary in here