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The spring rates are stiffer on coilovers, that is why they limit body roll. The shock valving also has to be stiffer to match the spring rates. If the valving does not match the spring rates close enough the car will ride bouncy or very jarring. Coilovers are better because they are stiffer and more adjustable. The quality of coilovers is judged by their durability, adjustability, shock design and valving, and overall coilover design.
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