Vortex. not only does it draw smoke from the sida, you have 4 holes instead of one. not to mention, the whole vortex idea forces smoke to pass the shisha and juices, as where the funnel skims the top. The mod for the funnel basically makes it a vortex except the smoke goes to the outside edges, away from the center of the shisha. Vortex is the perfect bowl.
Give a man a match, he will be warm for an hour. Set that man on fire he will be warm the rest of his life.