As much as I hate to say it, right now the best franchise in NBA history is the Lakers. They have been much more consistent over history than the C's and most of their championships have been won in the modern era (much tougher to do) than in the 50's and 60's with only 8 teams in the league. Between 1986 and 2008 our C's didn't do squat, and the Lakers were still one of the top teams in the league.
I think we can reload next year and get #18 which will put this argument back in favor of our C's, but right now it doesn't really look that great. That Laker team is already stacked and most of their key players coming back for an attempt at a 3peat. Ainge better go sign us some impact rebounders and defenders, because WE MUST NOT let the Lakers tie us next year in banner count.