spings are like something that you can't adjust unless you have adjust height shocks.. coilovers are adjustable using your stock shocks but can cause the car to be bumpy as hell... lowering springs are good if you just want to drop your car once, but coilovers are if you might be adjusting your car height due to things like changing rims, etc.. but remember.. if you get coilovers, its kinda of a good things to get some good shocks too.. correct me guys if im wrong...