Worst: Candy corn.
Best: I am a big fan of foreign candy bars. Curly Wurlies are my favorite, as they are reminiscent of the old 1970s Marathon Bar and they transport me back in time to first grade. I also like Cherry Ripe, Crunchie (or Violet Crumble), Maltesers, and Picnic.
Other than that, give me non-choco candies. Anything from Wonka (Nerds!), Sweet tarts (love the chewy ones), Star burst, gummi bears, Jelly Bellies, etc.