TV testing material and questions

Was wondering if anyone had recommendations on test media? Been a bit of time since I purchased a new TV, but wanted to verify everything was functioning as it should + verify my picture looks good.

also, if anyone had any experience, I currently use a latest gen Apple TV, plugged into a JBL Bar 9.1 (5.1.4) soundbar. Currently, I can not achieve Dolby Vision and Dolby Atmos though.

the new setup will be:

TV: TCL 75” QM7K

Soundbar: JBL Bar 9.1 (5.1.4)

Media Streamer: Apple TV (Plex, Direct TV and Prime are all we use)

Gaming: Xbox Series X, Switch 2

I ordered all new HDMI cables, although I am 99% sure all my old cables are “2.1” compatible so to speak, or “ultra” but just to be safe I did anyways.

So question 1: should I stick with my Apple TV or use the TVs google TV? I’m usually against TV built ins but people seem to love it on the TCL so was wondering.

Question 2: anyone have any experience with this setup and if so any recommendations?

Question 3: does anyone have any links to test media where I can test SDR, HDR, 1080p, 4K, Dolby Vision, Dolby Atmos etc? Would love to add a test collection to my plex server anyways. My plex server can handle pretty much everything (unraid, 128gb of ram, intel i7 11700K).

Here’s some links to test/demo media.

https://kodi.wiki/view/Samples

https://www.avsforum.com/threads/hdr10-test-patterns-set.2943380/

https://opencontent.netflix.com/

https://thedigitaltheater.com/

https://www.reddit.com/r/hometheater/comments/11qqv95/surround_sound_test_files_in_almost_every_format/

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