Good pointed above, especially by sgd on Shaquille.
One other point that is important, perhaps, is that how often did teams feel a need to double team either perk or Shaquille? Any difference there?
Or, did teams regularly have to pay attention to Shaquille when they were on defense? I doubt as much attention was given to perk in this area.
My point is that Shaquille may distract opposing defenses more even if the stats between perk and Shaquille are similar. That means less attention to the other celtics, and, if teams collapse on Shaquille he is better able to score through such defense or pass it out to a team mate.
And given that perk is out most of next year, I don't see this debate being "either or".
No matter how you stack it up, having oneil on the celtics is a plus.