I consider myself a reader. Maybe not as voracious of one as I was in my youth, but I do read quite a bit and my mind blanked. LOL, now part of it was the weird blanking out thing your mind does when anyone asks you to pick your favorite anything. But part of it also was that it's not as easy, for me at least, to pick out a favorite book villain as it is in a visual media, like a movie or TV series.
Alfred Bester from Babylon 5 is easily on my top 5 TV/ films villains of all time list
You see, the thing with books is that you are often much more privy to the thoughts of the protagonists, and although there may be a Big Bad they are facing, I often find myself more interested in the main character's internal drama. What is it inside the hero/ heroine that needs to be overcome? What is it the villain stands for that is so at odds with what it is the protagonist wants?
That being said, yes I did eventually come up with some literary villains (Melisande de Sherzai, Mrs. Haversham, The Overlook Hotel, The White Witch from the Narnia books, even He Who Must Not Be Named were stand out villains), but I still haven't figured who was my favorite. I suppose I'll just have to read more books and re-read my old favorites to be sure. September is coming, so I'll have a bit more reading time then.