As a former waitress I have worked in both scenarios. My opinion is that pooled tips work best. It encourages team work among co-workers and I feel benefits the customer as well.
Have you ever been dining at a restaurant, needed something and your waiter is no where to be found? In a pooled tip scenario all the staff work together to serve the entire restaurant, not just their own tables.
Chances are whichever waiter you find will be more than happy to bring you what you need in order to offer great service and encourage a better tip from that table for the over all pool.