Let's face it. Everyone has favorites. It is no different in the cloud storage world.
OneDrive for Business is a University sponsored, enterprise cloud storage solution. As a University employee, you have agreed to and are required to protect University data. OneDrive is one way to help you protect data that is owned by the University. The University has signed an agreement with Microsoft called a "Business Associates Agreement" or BAA. By signing this agreement, Microsoft agrees to protect your data in the same manner as if it were here on campus. You use your HawkID and HawkID password to access OneDrive. If you delete something and change your mind, you can get it out of the Recycle Bin for up to 90 days.
DropBox, Google Drive and other services like these are consumer based services. DropBox or Google Drive are useful for sharing with family and friends. The same level of agreement that the University has with its enterprise service providers does not exist with these services. You are on your own if something happens to your data. Consumer based services such as DropBox or Google Drive are only approved for Level I data.
Bottom line: If you have a need to store University data in the cloud, OneDrive for Business is the recommended option. If you are storing personal documents, you can use a consumer service.