I have used both types (push and pull) and the pull works so much better. As a matter of fact, I tested the two simply by putting my hand in front or behind the radiator and the pulling action of the puller fan created a very noticable draft as opposed to the push. It just works that much better.

Don't question it any longer and get the puller type and you'll be happy.

The car I have now was set up with a push type and I'm definitely yanking that and installing a puller.