What team had the greatest dynasty? Boston, LA, Chicago?

Definitely Boston. They won constantly and that's what a dynasty is pretty much. When you said best collective group, I ume you mean the strongest team. Then I can make a case for the Bulls since they went 72-10, but also the showtime Lakers with Johnson, Kareem, etc, since they played in what I believe was the toughest era, the 80's. Dynasty wise, Boston.