1. Killer Inside 2. Killer Reborn 3. A Dark Beuatiful Secret 4. A Game of Secrets 5. Snatchers Those are just pretty much my favorites.
I don't know if I'd call any of them "the best" but I could give you a list of horrible amateur written stories.
Lady Marian is my favorite fanfic writer hands down. I liked her battle school trilogy. (I think that's what it's called)
This is where amateur writers can write and relax. If you don't care about it I suggest you go back to active topics
I'd advise you to not insult dbo. He is among the most-revered FanFic members. He just shows his love in different ways.