Who is Santos Laguna biggest rival?

Could you please elaborate on the topic of Santos Laguna's biggest rival in the world of sports? Who would you consider to be their primary competition, and why? Is there a particular team that has a long-standing rivalry with Santos Laguna, or is it more of a shifting landscape depending on the current season and league standings? I'm interested to hear your thoughts on this topic, and how it might impact their performance on the field.