I think we have to concede that the Lakers have been much more dominant since the eighties than the Celtics. There is no getting around it. They won 5 to our 3 in the 80's, and while neither did anything to speak of in the 90's, the Lakers have won 4 to our 1 in this decade. Kudos to them.
However, everything up to the 80's, there is no room for debate. The Celtics were the most dominant team in professional sports, including the Yankees when you calculate on a percentage of championships basis.
I enjoy the fact that there is such a strong rivalry. It is great for the respective cities, their franchises and for the NBA in general. In the 60's, and even the very early 80's, the Celtics' main rivalry was with the 76ers. I swear, most Celtic fans did not even think much about the Lakers, because there was not much to think about. That all changed when Magic joined the Lakers. The media started talking up a new "Laker dynasty" going into the 1984 Finals. The Lakers had previously won 2 NBA championships let by Magic (and Kareem). Although the Celtics won in 1981, our opponents were the Rockets, and we were dismissed by the media as getting lucky with the Sixers, and not having to face the Lakers that year.
It was a foregone conclusion in the national media that the Lakers would dominate the Celtics in the 1984 Series. When we won that 7th game, I will never forget Red's excitement, and his basic "F You" to the national media (NY and LA dominated) when he said, words to this effect:
"This here is the real dynasty."
That is why we, as Celtic fans, take pride in our franchise' history, and what it has produced.
Thank you, Red. We will always defend "the real dynasty."