it’s a german techsite general overview on customroms (all major ones), rom specifics, the role of microg, substitue apps per rom, camera app quality, installation instructions.
It’s detailed in the right places. /e/ is at 7:24. You can run the transcript through a translate service.
The presenters tl;dw is “Graphene or Calyx for uncompromising Pixel owners, /e/OS for everybody else”