Those were great teams because they both had two of the greatest of all time on them. It wasn't the cast as much as it was the one leading them and making them look better.
Other factors would be MVPs, all nba, all defensive team ( important to me is, statistically, how well they shut down their man ), how clutch they were ( but more importantly, how clutch they were in the playoffs against the best. Did their game elevate when the competition and pressure were elevated ),and what other all time great players and coaches think concerning who is the best all time ( after all, these are the people that know the game best )