Creamy or "Smooth", because I cannot stand Chunky. And I should know; I eat a shitload of peanut butter. If I want solid objects in my peanut butter, I'll add them myself, thank you.
Chunky all the way. Even on things like toast. I like it on pancakes as well. I have no clue where I got that, but on the rare occasion I eat pancakes I like chunky peanut butter.
Creamy for life! Regular butter doesn't have anything crunchy about it, why should the peanut kind?
Also, how can you tell that cockroaches didn't crawl into your peanut butter if there are crunchy bits in it? With smoothe, you never have to worry about that.