ownCloud does not support true multi-tenancy since it requires instance replication to provide data segregation. True multi-tenancy shouldn't require the added cost and complexity of multiple instances
CentreStack offers multi-tenancy in a single instance with a single-pane-of-glass for management that provides a grand view of all the tenants and assets such as file shares, users and storage. The segregation and sandboxing of these resources are built-in and require no manual configuration effort or additional instances.
Are you looking for a secure file sharing solution that maintains data privacy, security and ownership? Are you trying to prevent employees from using ad-hoc personal Dropbox or 3rd party accounts that create problems like:
CentreStack provides true multi-tenancy with the following benefits: