Until someone can show me how Rondo creates more points when he is on the floor vs. Paul (since the numbers we have seen up to now points the other way) I have to believe the Celtics offense will be better with Paul.
Chris Paul 15.8ppg 9.8 assists per game
Rajon Rondo 10.6ppg 11.2 assists per game
So Chris Paul generates, on average, in one game, at least 35.4 points.
Rajon Rondo generates 33 points.
This is assuming every assist is for 2 points and without free throws. Let's tweak things to take into account 3 point attempts and going to the line.
According to team stats, for every 100 FGA the Hornets make, there are about 20 3PA. In addition, for every 100 FGA the Hornets make, they go to the line 28 times, and convert ~75% of them. This should bump Chris Paul up to ~39.6 points per game production. Obviously this is a rough metric, but for our purposes it's fine. Add in Chris Paul's own free throws per game his total is approximately 44.2 points in an average game.
If we use the same metric with the Celtics team stats (and you can do the math out yourself, not that I've shown you how I am looking at it; just go to basketball-reference.com), Rajon Rondo is bumped up to approximately 39.4 points per game.
Yes, these aren't the perfect stats, and the numbers are fudged a little, but the calculations between Paul and Rondo are consistent, so even if their absolute value is off, the relative value is just right.
Generally speaking, Paul, while on the floor, is better for about 5 extra points per game, whether from himself or from his teammates.
I am presenting this all without comment, for now, just so people can discuss the comparison accurately.
EDIT: Of course, this is not taking into account how differently Paul might play in the Celtics system, and only looks at raw point generation as opposed to inside v. outside. Still, good to know, right?