The Celtics have the most recent title, but the Pistons have more titles over the past 25 years and have not had to wait more than 40 years for back to back titles.

It is a pretty close call, but I have to lean towards the Pistons as being the more relevant and impressive franchise as they have won championships in the NBA MODERN era as compared to the Celtics who won the majority of their titles when the league consisted of less than 10 teams.