For me it would be the Snickers bar. I had one for the first time in a long while the other day and I really enjoyed it.
It seems I have been stuck in the rut of eating only caramilk type bars for several years. The reason I made the change was because the vending machine where I works doesn't stock many of my favorites. I do like the Kit-kat chunky, but they get a bit boring after a while. Twix is good too, but only for a change. I find that Snickers really satisfies me. I like all the peanuts.
I guess that just leaves the question: What is the best candy bar that you rarely ever eat?