Buying the series digitally often provides higher bitrates than standard streaming, which translates to sharper images and better sound depth.
While convenient, dual audio files can sometimes come from lower-quality "web rips" where the focus is on providing multiple languages rather than the highest possible bitrate. If you have a high-end home theater system, you might find the 4K UHD Blu-ray versions better for their or Dolby Atmos tracks, which provide immersive overhead sound for scenes like Quidditch matches or the Battle of Hogwarts. harry potter series 1080p dual audio better