I used to learn the beatles harmonies and guitar parts in high school from the stereo mixes. When I discovered that I could turn down one speaker to hear just georges guitar, or just the harmonies and no lead vocal, I felt like I discovered a big awesome secret. But it was really just a stereo mix. I've listened to both in mp3 format, and there are some subtle differences that I could never explain. I also couldn't say whether one mix is better than the other.