Without prep I'm favoring the Elite here. It seems a bit unfair like removing a cats claws, because Doom always has prep without prepping the moment a battle begins in most cases. This is because he has detailed intel on most if not all of the super powered characters on Marvel Earth. I guess that he could pull the same maneuver that he did on the Avengers before Sentry broke it up, but I have pretty high doubts. Elite wins IMO.
doom is tricky but he's not beating the elite in a non-prepped scenario. there isn't a guarantee doom could withstand black alone. he'd be defended against black's tp, but would his protection extend to his tk? he doesn't have to read his mind to simply turn it to mush. see black giving superman a stroke. his own shields and sheer tk power would make that 1on1 fight anything but a sure thing. add in the others and i don't see doom having much chance here.