There's not a whole lot of difference between the Region 4 and Region 1 discs. The local product picks up the additional German soundtrack, while the Region 1 disc has a couple of extra subtitles. They are otherwise identical. The real difference is between the Region 4 and Region 2 titles.
Compared to the Region 4 disc, the Region 2 disc misses out on:
An interesting comparison here and quite difficult to recommend one disc over the other. I'll suggest the extras, while very different on each disc, pretty much cancel each other out. I'll concede a draw and recommend you pick this up where you can get it the cheapest.