It depends on the question, the subject matter and the context.
Which is the better soft drink, Pepsi or Coke:
I am thinking of installing solar panels, is that a good idea.?
Do you believe in the Great Pumpkin?
What is the first thing you do when you get home from work each day?
So it is all a matter of context, so tell me which soft drink do you prefer, and are you really going to install solar panels and by the way, what the is first thing you do when you get home from work each day?