If you are talking about the KW Sports suspension kit (shocks & springs) then I would say it compares well. The Koni include adjustable rebound on the shocks (Fronts on car, rears must be removed) The KW sports suspension has no adjustibility, but otherwise quite similar.
KW list a suspension drop of 35mm front and rear, and the Koni kit 40mm front and rear. (they appear to be drops from stock height so take 15mm off for GTI)
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