Both liberal presidents, Benito Juarez and Porfirio Diaz had fairly different characters of government. Juarez fought to unite Mexico, leading the Reform War from 1858-1861. The war was disastrous, destroying Mexico's economy. Juarez's government was pretty tattered.
In contrast, Diaz' presidency was during a rather peaceful and stable time for the country, however this came at a price. Diaz was so interested in modeling his country after the sophisticated European countries, that he lost touch with his indigenous roots. He also terrorized the lower class and maintained very tight control of local government over his 30 years in office.
The caudillos were important to Latin American history because they fought to achieve power in the independent states in Latin American countries. They rarely upset the social order, which is beneficial to a creating a united front.