I have the Eibach Sportlines, the drop looks way better, the car handles bumps stiffer but nothing too harsh, but on the other end cornering is soooo flat and amazing and your car grips like 3X better (rough estimate
) Plus Eibach is a repsected company. If you are worried about a rough ride just go with the prolines... However, a camber kit is needed on the rear tires i think with the sportlines...