They sound similar.
There are many features in Canto that are different from what Box, Dropbox, and Google Drive offer, but there are a few main ones:
User Permissions – Canto allows admins to control who can see/edit specific assets. Systems like Dropbox leave access to all files wide open making them vulnerable.
Versioning – Canto allows users to go 'back in time' to previous versions of assets. Google Drive doesn't allow that.
Multimedia support – Canto excels in organizing and managing multimedia files with its Smart Album support. That's a particular that Box is lacking in.