This ones easy:
You ask either man, it doesn’t matter which, “If I were to ask the other guy which door leads to prosperity, What would he say?” Whatever the answer, choose the other door.
Martyr73 wins a pair of Spock ears.
Next week’s riddle will be harder.
Live long and prosper.
I would ask John Kerry “What hard evidence do you have in regard to the atrocities you accused your brothers of committing during the Vietnam War?”
Oh wait, wrong riddle. Sorry.
"Which of these positions is yours?” would do nicely.