Pretty sure it's all derieved from the same HD transfer worldwide. The difference would be because it's been released by both Fox and paramount that the encoding might be different.
by all accounts, the US BD has the slight edge because the video bitrate is slightly higher. If it's audio your after, best bet would be to look at the Asian releases and quite a majority of titles have higher spec audio mixes (96Khz upsampled Dolby TrueHD for example)