Tough to decide, but for now I have to go with Pierce. The Davis video is still a "to be continued" in my mind. They need to win the series to complete it's awesomeness. Otherwise, that kid, and especially is idiodic father, will have some sense of contentment, and we can't have that.
It's almost like the 2002 comeback against the Nets. It's great to watch because it was so remarkeable and it set a record, but I can't watch that without being reminded of the fact that the Nets won the next 7 playoff games against the Celtics after that.
I want to remember Baby's shot as the shot that turned that series around and led to their ultimate victory. Not just something that extended the series.