@CoDa_ZRH @s2d
The differences are dramatic.
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the first is that Elemental is based on old Twitter Bootstrap, and Atomik is on Botstrap5
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the second is that if you install with the version without content you won’t get access to some important Bootstrap5 elements in Atomik, (Empty page list (Blog Entry Grid))) (Creating board 9.1.3)- so don’t go that way yet (supposedly they are working on fixing this) Empty installation - Atomik or Elemental
The best method today is to install a full service with Atomik and remove the pre-installed content.
Probably with version 9.2 fixes will come.