There are three product editions: Enterprise, Growth, and Community. In terms of architecture, it is a single system (one core) with various sets of modules. The Enterprise edition has more modules; most of them are used for product management in big companies (with a need for approvals, complex access rights, a complex hierarchy of operators etc.).
In contrast to Pimcore, there is no complex attribute hierarchy in Akeneo. Attributes are classified into attributes, attribute groups, and families. There is no possibility to create an abstract entity you can inherit from. For example, you cannot create Furniture category with the corresponding attributes, and then enrich it with Sofa and Table subcategories, which will be added as Furniture attributes.