Ocis/OpenCloud can integrate with Collabora, OnlyOffice but don’t currently have things like CalDAV, CardDAV, E2EE, Forms, Kanban boards, or other extensible features installable as plugins in Nextcloud.
If you desire a snappy and responsive cloud storage experience and don’t particularly need those things integrated into your cloud storage service, then Ocis or OpenCloud might be something to look into.
Ocis/OpenCloud can integrate with Collabora, OnlyOffice but don’t currently have things like CalDAV, CardDAV, E2EE, Forms, Kanban boards, or other extensible features installable as plugins in Nextcloud.
If you desire a snappy and responsive cloud storage experience and don’t particularly need those things integrated into your cloud storage service, then Ocis or OpenCloud might be something to look into.