Hershey's Chocolate Experiment

I ran an experiment at work.  I bought a bag of Hershey's chocolates for Halloween and left a bunch on my desk every day.  They consisted of Krackel, Mr. GoodBar, regular Hershey's milk chocolate, and Hershey's special dark.

Without fail, the Krackels were the first to go.  As for the other three, there was no clear distinction.  I would lean towards Mr. GoodBar being the last ones left on average.  But without a doubt, Krackel is first to go.