Tenant to Tenant Migration

Hi techie guys,

Our IT department will be doing a big job ahead, tenants to tenant migration, huh. We are planning to move 2 tenants to a tenant (different domain name than the two), having said that 2 old tenants will be removed after complete migration and will be disconnected. We have to migrate data from mailboxes (8-9TB), SharePoint sites and data, Microsoft Groups, Distribution groups, Public folders data, MS teams, One Note, Planner, Calendar, contacts. 

Tenant A has exchange Hybrid environment with all mailboxes in Exchange Online and synching through AADConnect.

Tenant B syncing with AAD Connect. 

In addition to, In tenant A we have some users of Dynamics 365 and have workflows and data in it, this also need to be migrated. 

I read few kbs from Microsoft stating that tenant to tenant migration is possible but want to know how practically this is? How about our Data, will that be migrated? 

We have to ensure that all Data migrate to new tenant smoothly. All Data mean Mailbox, sharePoint, MS teams, Groups, Public folders etc..

Please share your thoughts and  experience of tenant to tenant migration