The Region 4 version misses out on:
A Pan & Scan version
The Region 1 version misses out on:
French Dolby Digital 5.1 mix. The R1 only features French Dolby Digital 2.0 surround encoded.
4 theatrical trailers for: The 6th Day, A Knights Tale, Hollow Man, and The Thirteenth Floor.
Given the PAL transfer and the cost difference between the R1 and R4 versions of this title, the R4 would have to be the version of choice.