The region 1 disc has been available for several years, and contains a couple of extras which the Region 4 misses.
The Region 4 disc misses out on:
The Region 1 disc misses out on:
The making-of featurette is, from all reports, incredibly brief and hardly worth the bother. Ditto for the trailers, so I really can't recommend either disc as the preferred option, especially without having seen the Region 1 transfer, which is now more than three years old. From the reviews I can find the transfer sounds similar to the Region 4 version. I'll call it a draw and recommend you pick the disc up wherever you can get it the cheapest.