Tanabe Super Down vs. Eibach Sportline

[SilviaSR20DET]

Im looking into purchasing a new lowering spring for my 96 240sx and wonder which one will perform better. I currently have the eibach sportline on my other car a 97 240sx and performs very well and the drop is nice too. The tanabes will drop 2 inches in which is perfect but unaware of its performance in handling. Which of the two would be a higher spring rate or are they about the same? Any help will be great, thanks.

[240Stilo]

The higher spring rate between product A and B would be C. The RS*R race springs which have a 5k.g. front and 4.5k.g. rear spring rate. Yeah sorry for mentioning something not on the list. By the way these lower 1.4 front and 1 in the rear so I don't know if it will lower your car to your liking. One more thing, stiffer isn't always better, but I don't think RS*R would make a crappy product. Mating it to a better than stock strut would help.