Uhm... I admit I find the endless effort to type such untypable characters quite amusing, but really, Bella and Edward can't be typed, because their characterization is close to zero.
We know next to nothing about Bella and Edward's personality, because all their actions and thoughts revolve about their hormone-driven infatuation; apart from that, their inner life is non-descript. Let's face it: even though the autor might be quite skilled at describing such a hormone-driven infatuation and presenting it as "fatal love", and thus fulfilling dreams of all girls who also think that infatuation = fatal love, she absolutely sucks at characterization. She's not even able to create proper "stereotypes" (well, maybe she sometimes succeeds at least in this when it comes to secondary characters, but definitely not the main couple), let alone
types. My personal guess it that she initially wanted to make Bella an INFP (stereotypical "strange, dreamy heroine") and Edward an INTJ (the "Mr Darcy" romantic stereotype), but she utterly failed at both.
Therefore, if someone manages to type them, they can be sure that their own imagination played a bigger role in it than the autor's skills. (As an example, I have an ENFP friend who identifies with Bella to a T; the friend is currently infatuated with an ESFP, and she without any doubt thinks that he's very similar to Edward.

) And the fact that people in this thread will never be able to come to a consensus about them is a good enough proof for that.