I think that either of your springs will yield a compliant ride as they are probably the two most popular choices and are progressive springs which are typically optimal for ride quality. H&R will lower the car a bit more than Eibachs but both are quality springs.
Most people will say that if you have the means, just go for a set of coil-overs as they will cover any adjustability needs you may have and will outperform springs but obviously they cost more. I will be installing a set of Swift springs in my car in two weeks so I can't comment on how the car's performance will improve with a set of springs but some have said the Swift Spec R springs are the closest you can get to coil-over performance with springs.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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