You can look at the Forrester and Gartner of this world, but for a less subjective and more objective metric you can look at the statistics related to the CMS used by high traffic website [0]. I won't even say Wix, Squarespace, Joomla (is this still a thing?) or Shopify are in the same category of AEM, they missed a lot of the qualification criteria to be considered an enterprise level CMS.
[0] https://w3techs.com/technologies/details/cm-adobeexperiencem...