Id say Ndrangheta.. Based on what we read the Ndrangheta makes far more money than Sinaloa cartel but i guess we never know for sure. IF its true id say Ndrangheta. Yes Yakuza makes as much money as the ndrangheta or maybe even more but its not the same worldwide. They are only powerful in Japan, plus much of their income comes from legal activities from actually legal guys/noncriminals. Russians would be nr1 but if your gonna say Russian mafia then you would have to compare them to all the 4 Italian mafias or like all the mexican cartels, not just one organization.