What is the difference in election process in China and Mexico?

Elections in china are based on a hierarchical electoral system, whereby local People's Congresses  are directly elected, and all higher levels of People's Congresses up to the national peoples congress, the national legislature, are indirectly elected by the People's Congress of the level immediately below.
 

Elections in Mexico determine who, on the national level, takes the position of the head of state – the president – as well as the legislature.

The president of Mexico is elected for a six-year term by the people. The candidate who wins the most votes is elected president even if he or she does not have an absolute majority.

Since no President can serve more than a single term in office, every presidential election in Mexico is a non-incumbent election.