I guess we'll never know. Been on this forum for 6 years almost. This discussion pops up so much. Especially the Albanian vs Cosa Nostra or Russian vs Cosa Nostra groups where everyone bashes each other backing their info on some 50 year old Gasoline bust by Feds or some pushed up news articles based on nothing.

I actually doubt that any of these crime groups you name - have been fighting internationally with each other. Or that they ever will. More or less they will actually try to work together if it comes to it to make more money. Thus as people said before - all these big crime organizations are divided into smaller groups. Which can be stronger and weaker than others.

And in what way actually stronger? Manpower and their discipline? Their strategics in business? Influence over other groups?

It's a large subject and hard to actually make and conclusion. Starting from the fact that all info available to anyone of us are police reports, news articles, some books or something some guy who maybe was in contact with them told to us. We'll never know of everything any of these groups done in their business as it doesn't get documented like police work. And simply because no-one will tell everything of it, just for the fact to not sit life in prison.