The Chanel on is the most expensive, each of the Haute Couture dresses Nicole wears cost about 200k each, the diamond pendant was in the millions, Nicole got a good 5 Million from that deal plus the costs for Rodrigo Santoro, making the sets and the special effects.
Now the Pepsi one might be expensive but only in terms of distribution and how much they paid to have it aired and when. You can see the obvious differences in the set designs, clothing and so on in the Pepsi on and the Chanel one.