An outfit is only going to be as strong as the government they have ingratiated themselves with, and no stronger than that government is itself.

Because Italy seems to be so anti-organized crime, that would eliminate any and all mainland Italian syndicates from the top of the list because not being in the favor of their home governments puts them on shaky ground.

I have read that Bolivian drug traffickers will not leave the borders of their country to transport drugs....because production of cocaine is (or was) legal...within their country. That makes their organizations pretty strong.

In another example, Canadian Cosa Nostra seems stronger than American Cosa Nostra at this time, due to the differences in the way crimes are prosecuted in the US versus Canada. In Canada things are easier for an outlaw, therefore they are probably stronger. What does it matter how many made men you have, how many guns you have, and how much money you make...if you are under indictment???

It really might come down to who has the blessing of their government and how strong their government is.

I would say the Caruana and Cun-trera mafias are right at the top.

I can't make a fair comparison of OC groups against one another world wide because I've never looked up the list. All I can do is put forward my formula for what makes an outfit truly "tough".