The best features of Microsoft Entra External ID include its unification of B2C functionality and B2E features. Microsoft calls it B2B, but it's better to say B2E since it means business to inside of your company, similar to the old Azure Active Directory. EID has both B2C functionalities and B2E functionality. EID has a unified external identity provider, external application, and external user, unifying these objects and internal workforce users, as Microsoft calls them. EID unifies workforce users with external business partners, which is a very strong feature. Azure AD B2C cannot unify both, as it only provides B2C consumer identity IAM platform features. Therefore, the most important feature is the unification of B2C and B2E. I have utilized the adaptive authentication feature of Microsoft Entra External ID; I evaluated and adopted it in a virtual environment that mimics a real customer system, similar to a sandbox. We evaluated and deployed EID to our customer system, including authentication.
