I have a question about Mexican history?

Why are Zapata and Villa largely romanticized while Caranza and Obregon either largely forgotten or even demonized? Were they not a great improvement over Diaz and Huerta? Or is it widely believed that Caranza and Obregon simply moved Mexico from dictatorship to oligarchy? And would Villa and Zapata really have been able to enact all of the reforms that they so desired? It seems to me that they were immortalized only because they never had a chance to actually govern, and this usually exposes the faults of a man....