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I own KW's and I'd go for Bilstein B14/16 if I'd do it again. Better quality and better value for money.
Depends on what you're looking for but than again Kw uses old Koni technique and adapt it to be sportier.
Overall you can say that kw offers a bit more comfort (at least KW V1/2) and is a bit cheaper. Bilstein gives less ride comfort with their B14 but feels faster and uses much better materials (I do like the height adjusting system).
Between V3 and B16 pss9 there is not much difference apart that the bilsteins seem to be better built to me.
If you also do trackdays I would go for B14/16 or V3 (before chosing something with electronic adjustability) the rest (kw v1, the Eibach equivalent, B12 etc. ) is more for road use only.
Both offer good reliability but both do have a limited lifetime (and I've seen leaking shocks from both brands) when used for what these are made for (but can be refurbisched).
I know that bilstein had a B16 version for some time that was really unreliable but the recent ones seem to be better build.
And for the critics. I've got a fully adaptable Tein kit on my lexus which is so much better than what the above mentioned brands offer that I would choose it when it would have something for mark II Seat Leons.
Not trying to make you defend your reasons but what experience do you have to account for your judgements?