The Gambino's are stronger thanks to John Gambino. The Genovese are the strongest as many has stated the reasons above. Because of the links between the Gambinos, Sicily, Canada, and Italy many will say they are the strongest family in the United States, this I don't believe and the reason is that Law Enforcement finds out many things the Gambinos are up too, while they have to breakdown doors, try not to lose people they are tailing, and trying to get a source in Genovese establishments, just to get a faction of the story and crimes in that family.