Delete data on plugin uninstall?
In some cases website administrators would like to keep the plugin data in the database for future use – even if they remove the plugin.
E.g. you can set this to disabled if you don’t want to use a-staff plugin any longer, but you’ve added lot of Staff Members using it in the past. In this case you can use the stored data with a custom script or access it again if you install a-staff again.
But in 99% of the cases the enabled setting is the better choice, as with this setting the plugin’s uninstall process won’t leave any junk data in your database.