Dolby Atmos and DTS:X Ultra are both surround sound technologies that use object-based audio to create an immersive and realistic audio experience. Both technologies allow sound objects to be placed anywhere in the listening space, rather than being tied to specific channels, which allows for greater flexibility and realism in the soundstage.
There are some differences between the two technologies, however. Dolby Atmos was developed by Dolby Laboratories and was introduced in 2012, while DTS:X Ultra was developed by DTS, Inc. and was introduced in 2016. Dolby Atmos is more widely supported by consumer electronics manufacturers and content creators, and it is supported by a larger number of home theater systems and devices. DTS:X Ultra, on the other hand, is generally considered to have slightly better sound quality, with a more realistic and natural soundstage.
Ultimately, the choice between Dolby Atmos and DTS:X Ultra may depend on personal preference and the specific home theater system or device that you are using. Both technologies offer excellent sound quality and immersive audio experiences, and it is worth considering both when setting up a home theater system.