all of them
The most improved team is the Lakers.
detrioit pistons
The Boston Celtics won the most NBA championships. They won 17 NBA Titles (
The least successful NHL team are the Columbus Bluejackets, in the NFL the Arizona Cardinals, in the MLB the Tampa Bay Rays, and in the NBA the Charlotte Bobcats.
The Boston Celtics have won the most NBA Finals and thus the most NBA championships with 17.
The record for most made shots in a NBA carrer is Reggie Miller (USA) .
The Boston Celtics, with 17 NBA championships.
Celtics
The Chicago Bulls.
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Celtics have won 17 championships, and Lakers 16 - the two teams with the most championships. So yes, in many ways they are the most successful franchises in the NBA.