Just in case you were wondering, rats prefer Snickers candy bars over other leading brands. And here is the proof.
My parents sent a package recently with the above candy. The rats, having successfully nibbled through the envelope, were met with a choice: Snickers, 3 Musketeers, or Buttefinger. They ate all the Snickers, all but two of the 3 Musketeers, and left the Butterfinger unscathed. That's about how I would have eaten them, as well.