I don't think it makes much sense that there are two groups of applications that perform similar tasks.
Both groups, Vault and BIM360, have many similar functions, but BIM 360 has functions that Vault doesn't have (For example: work in the cloud and some more). And Vault has functions that BIM360 applications don't have.
I suggest that the BIM360 applications be linked to Vault, perhaps as independent modules that can work seamlessly with a Vault installation.