I can speak on previous H&R vs. Eibach lowring spring debates going back to 1995. Eibach's have always been more "comfortable" versus their H&R counterparts. They both have offered similar performance. Both products are aimed at sporty daily drivers.
With that said, it's really a personal preference thing. The Eibach's are going to be more comfortable, while the H&R's are going to be more sporty.
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