Impressionists or Ventriloquists: Which are most worthless?

I think that these two "talents" are about one step above mimes and people who paint themselves to look like the Statue of Liberty and then stand real still for long periods of time.

I say impressionists (people who do impressions of people, not painters) are the most worthless, but I have a friend who says different. So I put it to you, great people of A2K: Which of these two horrible forms of entertainment is most worthless and least entertaining?

If you had a bus full of people that you were about to shove over a cliff, would you rather have it full of impressionists or ventriloquists?