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is there a difference between the prokit and sportline
is the ride better with sportline? etc.
(besides height.)

 
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-----> Suspension

 
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Pro Kit - the legendary spring system that dramatically improves both a vehicle's performance and appearance. By lowering the cars center of gravity, the Pro Kit reduces "squat" during acceleration, body roll in corners and excessive nose dive under braking. The Pro Kit is the choice for auto enthusiasts everywhere, including factory installations by Ford, Toyota, Audi, and others.


Sportline - For the extreme enthusiast who wants the lowest possible ride for the street, Eibach has developed the popular Sportline brand of spring sets. Sportline makes a dramatic statement by combining race car looks with higher spring rates to maximize street performance. Sportline springs use precision rates to provide the ultimate compromise between lowering and ride quality

^ripped that off an eBay auction


Their springs are designed for stock suspension, that's why the most you can get out of their springs is 1/1.5 inches. the more drop your springs give your car, the more weight it puts on your stock shocks, and results in a bumpier ride qulity

 
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To add to the above, the Prokit is about 10-15% stiffer and the Sportlines are 20-25% stiffer over OEM springs. At least this is what the Eibach tech told me.

 
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Why not look on Eibach's site? Also, the FAQ tells you that the sportlines drop lower and they are stiffer.

there is no good, better, best. You have to find out what you want out of your car and then decide.