Application properties should be used when one or more of the following are true:
For example, storing a string/string key pair of
api_url and http://www.1and1.com/website-builder would be a valid way of using app properties. This URL could be reused across all your application screens or windows and would be related to your application, rather than your data.
If your data is complex and needs to be joined, ordered, or queried while you are retrieving it, then you are better ...