Dropbox has worked well for use. We use profiles, keeps everybody out of our global. 6 different locations, CADmep/Revit, ESTmep and CAMduct all tied to one database. Dropbox also worked out great when everybody had to work remotely, no VPN required to access the database. The way dropbox works, I do not see many cloud services offering the same syncing methods they use. I did not try BIM 360 Doc but did try One Drive, One Drive failed miserably.