Those and Megan and a few others all use shocks made in the same factory, from what I understand. The rest comes down to the details of what hardware comes with the kit and spring rates.

I've had good luck with K-Sports on my car and have done extensive competition in another car on K-Sports. No complaints. They're quite streetable with the shocks set near soft. I only got sick of mine after a year of running rear springs that were 3x stiffer than what came with the kit... can't blame them for that.

Like any other coilover kit, SETUP is important. If you set them too low and/or don't set the shock length correctly, ride quality and handling will suffer. If you don't get too greedy with your ride hight (by setting them too low) and set everything up properly with good alignment and learn how to adjust the shocks, you can have good street ride quality and excellent handling.

If you can find spring rates for the kits (good luck, can be hard to find for some of them), for a FWD car, you want the one with the highest REAR spring rate relative to the front. Most street kits tend to stiffen the front more than the rear, thus increasing the understeer bias of the car. More rear spring rate decreases the understeer... but at the expense of a little bit of ride quality.