It really depends on what your future plans are for your car and your road conditions. The Pro Kit definitely has a softer ride than the Sportlines, and they still allow you to use your stock struts without too much wear and tear. So if you're planning on sticking with the stock dampers for a while, or if you have to deal with rough roads and/or speed bumps, sticking with the Pro Kit may be your best bet. However, if you are going with performance dampers and do want to maximize your handling and get a really aggressive look at the expense of some every day ride comfort, then the Sportlines are for you.