Amazon Zocalo vs Box

Key criteria for that choice. I needed a collaborative backup tool for a 15 people team. All people would have access to both their individual private space that should synchronize automatically to/from their desktop and various shared spaces, with various kinds of access rights. Only Box would allow high fine tuning of the access rights. Multi-platform was important too. The ease to transfer ownership of a folder from one departing colleague to their N+1 was a real plus.