Perhaps this one will be very contentious (thanks for teaching me a new word): Who is better? Michael Jordan or Lebron James.
I'm glad you are not asking who is the greatest basketball player of all time, otherwise I would have to inform you that it is neither of those two.
Not sure if this one will stir any debate but I thought to add it anyway to the list: Which OS Do You Prefer? Perhaps this one will be very contentious (thanks for teaching me a new word): Who is better? Michael Jordan or Lebron James.
Ouch.
If you really wanna start a forum war: 'Which religion is best / true?'