The two most popular brands of cola are Pepsi and COKE. Pepsi is a 5 letter word, while COKE is a 4 letter word. Both of these brands have been around for decades and are well known for their iconic logos and slogans. Pepsi was first introduced in 1898 and has since become one of the most recognizable brands in the world. COKE was first introduced in 1886 and has become an international symbol of refreshment. Both of these brands have been enjoyed by generations of people around the world.