Private Docker Registry is for organizations with multiple users, teams and projects in a LDAP/AD environment with unlimited private repositories.
Ranked in these QuestionsQuestion Ranking
Pro Multiple namespaces
Multiple namespaces can be defined, for each project or team.
Pro Dedicated hardware and lightning fast
Docker Hub is extremely slow. Here you get a 300Mbit/s dedicated line.
Pro Integration with LDAP, Active Directory and OAuth
Not everyone provides this feature in its basic plan. If it is there, the plan starts at 500$ minimum.
Pro Unlimited amount of private repositories
The only provider providing this option in the basic plan.