Based on the specs alone, DTS beats its rival with higher bit-rates that promise a more realistic movie experience. That said, other factors such as signal-to-noise ratio and speaker calibration mean that plenty of audiophiles would rate Dolby above DTS.
With standards constantly evolving, the best way to upgrade your movie night is to ensure you have good-quality components, set up properly and fed the highest possible source material. That way, whether it's DTS:X or Dolby Atmos, you'll be treated to thrilling home cinema entertainment.