|Angelic Layer-Volume 2: On a Wing and a Player||=|
The Region 1 version was released late 2003. It has the same four episodes as the Region 4 disc. The front cover looks quite similar, with the same character shots, but a darker background on the R1. As far as I can tell, the discs have the same extras.
The R1 disc is reported to have a fantastic transfer, with minimal aliasing, but R4 is a very good disc, too. I'm happy to keep buying the R4 discs.