If it helps, I switched from KW V3 to PSS10...
I think a combination of; Me having less experience of other premium coilover kits, the roads where I lived at the time (Germany) being in much better condition and having never really had the chance/need to adjust the V3s, led me to think they were great.
I thought I was probably bonkers for shelling out to switch from one 'premium' coilover kit to another. But....
The PSS!) are far better than the V3s were!
It maybe an [edit] *isolated issue but the guy I sold the V3 to said they developed a knock or a squeak (can't remember) not long after fitting. They had been on my car previously, looked after and done around 35k from new.
It could probably happen on any car in the winter with road use but the adjuster ring did seize on the V3 while I owned them so I chopped it off & bought a new one;
The Bilstein are much, much easier to adjust. Im not sure if KW have since revised the design.
Bilstein have a Uk base in Leicester, which I learnt recently and can be called up on for advice on settings and/or support.
My rear shocks. Im sure you know what they look like lol;
I often run the dampers on the softest setting on the road and try settings from medium to hard on track and am really impressed with the PSS10!
@vRSAlex at AKS Tuning sorted me and quite a few others on here with my Bilsteins, Ive added adjustable top mounts and adjustable superpro ball joints. Makes an awesome setup for road and track.