I am installing 20" rims, do you think the kyb agx ajustable will work better or the shocks that comes with the springs?
When it comes to wheels, you have to build / setup the suspension first, then choose a wheel.
Building a suspension around a wheel is not really the way it's correctly done, only because it's very difficult to alter a suspension on a vehicle (and expensive), while changing a wheel takes 5 minutes.
KYB AGX units are adjustable (the valving) so you can adjust the setting and set the car up to handle well.
You can adjust them to different road and track configurations.
They can also be used with aftermarket springs (up to 1 1/2, no coil-overs) if you decide to change the spring too.