Of course Coca-Cola is more popular.

First of all, Coca-Cola has entered the mainland Chinese market as early as the 1980s, and even the word "Coke" is directly transliterated from Coca-Cola.

Secondly, the formula of Pepsi-Cola is imitated by Coca-Cola. The original formula of Coca-Cola is still unknown to outsiders.

In addition, Pepsi-Cola tastes sweeter, is easy to get tired, and is also easier to gain weight.

In short, Coca-Cola is superior in terms of the time of production and entry into the Chinese mainland market, formula and taste, which also makes Coca-Cola more popular in China.