Coilovers have a different internal structure with the bleed setup and bypass system as well to handle for the increase in spring rate when you compress the spring down further. As has been said, they aren't anything special on our cars because that is how they come from the factory being MacPherson struts. The rears aren coilovers, they are seperate springs and dampers. The only real benefit is maintaining a matched spring and damper ratio no matter how low or how high you have the system setup. Plus the handling control if you go with a reputable brand.
I've had adjustable dampers before and aside from the first initial tweaking, I never touched it again. A good matched spring and damper combo is just as good as a high end set of adjustable coilovers. Still, if I could afford a set of KW V3's..... or DDC's....
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