The main difference is how you hit the tires. I've run both and I prefer the no hop style. The lift bars work with a lower power car and tend to make the rear squat on launch. The no hop style make the rear lift, as the axle gets driven into the ground the chassis has to go up. 4 link cars ideally have the lower control arm parallel to the ground and the upper bar set to so that, in theory, their intersection point is on the neutral line of the car and on the center of weight. The neutral line is an imaginary line drawn from the contact patch of the rear tire to the upper ball joint on the front end. This sets up the rear suspension to most effectively lift the car and plant the tires.