Lowering springs for Performance: Eibach vs. T Sportline

[diggity]

I lowered my 3 AWD and used T Sportline and am now thinking about lowering my Performance Model 3. However, I can't find too much info on Eibach vs. T Sportline. Eibach has a larger drop in the rear by .2" and I am wondering why they did this and how much reverse rake it creates? Also, I was wondering how the ride quality is on each for those who have done this modification? I don't really want to feel the road more and know that I can't compensate that much for ride quality by lowering the PSI on the 20" all that much.