A Serbian Film was originally shot in Serbian. To appreciate the director’s original intent—a brutal allegory about the political violence and censorship in the Balkans—you cannot rely on dubbing. The visceral nature of the dialogue requires (not hardcoded, low-quality translations).
Regardless of your reasoning, the lifestyle of an extreme cinephile requires . You should never pay for bootlegs that fund piracy rings, nor should you seek out unrated cuts that were edited for violence without context.