Xbox Update Preview Delta or Omega?

which one , i see upadte preview omega and update preview delta?

G'day,

These are the latest Xbox OS and also the Beta, Delta and Omega rings of Insider Preview Program are also on the latest release
to General Availability builds.

In my understanding the Dashboard experiment, A, B, C selection, is totally random.

As "Both consoles say their OS Version is (19h1_release_xbox_dev_1911.191028-1335)" your consoles are either in the Beta or Delta ring.

Both those rings and Omega ring are getting a preview update News release notes Beta Delta Omega
Insiders today, which you can manually start or wait until it becomes mandatory.

After you do the update, if you want to change rings, it will be the perfect time to change as all those rings will be on the same release. Subject to eligibility.

If you are part of the Insiders preview program, consider going to a ring which has less frequent updates, like Delta or Omega.

Alternatively you can unenroll from the program, so you only get GA (General Availability) updates when they are released.

I really wouldn't like to say yes to that as the Omega ring gets updates just before general release so the odds aren't good.

The current Xbox One Update Preview rings are:

• Alpha – Open on an “invite only” basis and receives updates at the earliest point in the preview window.
• Beta – Open to Xbox Insiders with a Program tenure of 3 or more months and an Xbox Insider XP Level of 5 or higher. This ring receives updates shortly after Alpha.
• Delta – Open to any Xbox Insider with a tenure of 1 or more months that has reached Xbox Insider Level 2 or higher. Depending on certain edge cases where further attention is required from Alpha or Beta rings, Delta Insiders may receive
  system updates before Beta, though this is not a common scenario. Additionally, while early system updates are not guaranteed across the Delta ring, all Delta Insiders will receive the update prior to GA.
• Omega – Open to anyone and receives system updates shortly before the GA (General Availability) release.

https://support.xbox.com/en-US/xbox-one/console/xbox-insider-program