Here is the response I received from ESRI tech support:
"Either method would be appropriate, however, tracking using editor tracking may be a better alternative than using the Attribute Add-In. The attribute add-in works at the client level which can be disabled when upgrading the software or if the client machine forgets to turn it on. In some scenarios, it may be better to turn on editor tracking since it works at the database level tracking edits. This means that when upgrading the software or when changing machines, you may not lose this functionality.
