I consider the Margs, Soto Karass, Jose Luis Ramirez style to be more Mexican style than Chavez, tbh. That kind of drape themselves over you and throw 1000 punches type of deal is something I've always considered Mexican style, if anything. JCC was much more measured and technical. That being said I agree there's really no one style to call "Mexican."
However I've wondered this for a longtime so I'd pose this to the other guys here: Is it just me or are there a dearth of southpaws from Mexico compared to boxers from other countries out there? JLR was a southpaw and it's not like they don't exist, but for the amount of great Mexican fighters, there seems to be less southpaws than normal, even for southpaws which are obviously in the minority to begin with. I don't know if this is true or not, obv, just an observation, but I always thought that the left hook, esp to the body, is such a time honored tradition that if you're left handed it just makes it easier to land that punch with even more devastation than normal.
Maybe that's a stupid theory but it's stuck out to me for awhile. Same with Cubans and them seemingly having so many great southpaws compared to the rest of the world.
@Marc A or any other Mexican dudes here might have better insight than most....