When you are given the challenge of "Make people of Dallas Smile". Whoever does the best job stays, who ever doesnt , goes. That, to me, is far more difficult because there are thousands of ways to approach it and you have to be completely original. What the winners came up with was unique and hilarious.
As far as the Apprentice. Great show, but they all had to do the same thing, and they did it as a team only. When you are told to sell lemonade, thats a closed end challenge. When you are told to manage an event, or a restaurant for a night, thats task driven, not much of an intellectual challenge. Its not necessarily easy, but you have a good idea what you need to do, and you are limited by the context of a restaurant, charity event, etc. At least IMHO