It's really different markets and preferences + different road conditions as mav and Orbital said.
There have often been different suspension tuning philosophies when it comes to Japan, Europe, and now US based suspension companies. Part of it is based on each of our roads and tracks, not because one is the "best" way. For what it's worth, in the past I've questioned the spring rate choices of a lot of the JDM coilovers because of inconsistencies across different cars and their motion ratios (like GD and GR Impreza having similar spring rates but very different rear motion ratios). Some of them have picked up on this but not all.
- Andy
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