Hi
I would suggest to go through the link below which will provide a clear understanding on different types of surrounds and their modes used in Home Theatre.....
https://www.digitaltrends.com/home-...ound-sound-guide-different-formats-explained/
Also....it is not guaranteed that the content we download is TRUE DD or DTS or Atmos.....same applies to available DISCs in the market....unless it is indeed an original Disc which has proper 7,1 or Atmos or certified surround content.....
Most importantly, the surround sounds as in which will play and how loud is decided by the movie content....every movie is not the same and the movie maker (Director / Producer) may decide certain sound effects (surrounds / atmos) to be louder or similar or play at the same time to create the awe effect and make the audience spellbound / enchanted by a certain scene.....
In my opinion....i honestly after auditioning Atmos at What HiFi show for the last 3 years dont find much difference to a normal 7.1 setup