I hate Los Zetas, and other mexican cartels. They are insane, i've seen how they cut people's heads with knives, chainsaws, and then they boil them. They are a bunch of wild animals, they don't have code like the rest of the respected gangsters. Their code is the money - they do horrible things for them, they are unable to do sitdowns, or solve the problem other way. They just kill everyone, and torture them.

I like Yakuza, Vor v zakone, all gangs who have some code of honor.