I had sportlines before my H&Rs. The sportlines feel a lot looser spring rate and set the car uneven leaving the rear lower than the front. H&Rs are stiffer and leaves the car settled lower in the front and higher in the back. Both springs work great for what they were designed for, and they'll add a much more aggressive stance to your car. But if ride quality is a big factor in what you're looking for and you want something that feels closer than stock, I'd say go with Prokits.