Tyres, you either buy the brand that are oe, buy them for best cornering, buy them for their ability in wet conditions, or buy them for their longevity.
You do not say which model of Kumho.
Personally, I removed the Kumho's, which were fitted to my x type when I bought it, and replaced them with Uniroyal rain sports. Wet weather handling improved dramatically. Dry handling is very good, i am not one of those that tries to take every corner as fast as possible, and have now covered 13000 miles with them and they still look like new. There was a slight increase in road noise.