Logging apps comparison

Can someone tell me the difference between the logging apps:

  1. Audition/Logging
  2. Log reader
  3. Activity Log
  4. Activity
    Are these fully or partially redundant?
    I would like as much easily accessible (For admin) logging as possible.
    Is there a best app or combination of apps for this purpose?

One thing I would like which does not appear available (except by going to the log file in NC directly) is the IP address of those accessing and downloading shared files.