Who was more vital to their teams success: James Posey for the 08 Celtics or Trevor Ariza for the 09 Lakers?

Trevor Ariza stepped up alot. He is the next Lamar Odom. I think Ariza was more key for the Lakers.. The Boston celtics had a long series with the Lakers, so they went deep into there bench to Eddie House, James Posey, Leon Powe, Glenn Davis. The Celtics had many options on the bench. Ariza averaged 11 points, 4 rebounds with 2 ists. Ariza is a key contributor to the Lakers, he is there future with Andrew Bynum. Posey came off for the bench averaging almost 7 points. getting 22 mins. Also with 4 rebounds and 1.0 ists per. Posey was a threat coming off the bench. If the money is there look for Ariza to stay, but if he is approached with a big deal, he will not refuse. Ariza has to be smart with his decision because the future of wining is with the PURPLE and GOLD.