Without an iota of doubt, Coca Cola and Pepsi are the two biggest makers of Cola drinks in the world and the competition between them has been very aggressive especially in the developed worlds where their advertisements seem to attack each other.
They have spent millions of dollars on endorsement alone by targeting superstars and one which really caught the world was when Michael Jackson was made a mega offer by Pepsi and they eventually had a deal with the King of Pop earning them Billions of dollars in sale.