In most cases, JPN BD is better than US BD (very rarely there are disks with unchanged video stream, for example> Ao no Exorcist: Kyoto Fujouou Hen). I use the same parameters when encoding, so the 'Japanese rip' will be better than the 'American rip'. If there are no Japanese discs, then the rip is done with an accessible 'American'. As soon as the Japanese release appears, I make a JPD BDrip and replace the previously made US BDrip (an example of Akiba Animation).
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Allelujah
ReinForce (uploader)
Allelujah
Lupin the Nerd