I submit the following:
Pasolini
Wenders

It is hard to say who is best live or dead. Plenty will throw down their ideas, flex their egos, say this and that, but all that matters in film is what titillates the senses, what grabs the eye, throws you on the ground and screams "watch me". SO I humbly submit the above two, maybe not the best, but by far the most thought provoking.