iOS6 UDID - What advantages does identifierForVendor have over identifierForAdvertising?

Question

Apple is changing their privacy settings for iOS6 and deprecating device UUIDs (UDIDs). According to a WWDC presentation and the docs there are two replacements for the UDI

Answer 1

The important thing to know is that the backup of the identifierForVendor can only be restored to the same device. If the backup is restored to a difference device the identifier is cleared.