The Federal 595 isnt a "noisy" tyre when compared to some other UHP directional tyres on the market. You may find that you get a bit of a hum from them when cornering but overall they arent too bad, especially on Skylines.
The Kumho would most likely be slightly better for wet weather traction as it has smaller tread blocks, circumfrential grooves and more siping (small cuts in the tread for water evacuation) but due to the smaller tread blocks it would probably not provide as much dry traction as the 595, however I find the 595's to be very predictable and progressive in wet and dry.
In my experience I would say that the 595 is designed more for high dry grip and cornering as it has larger tread blocks (meaning more rubber in contact with the road) and a slightly softer tread compound than the KU31, but the Kumho would most likely be better for wet weather and slightly longer life... Although I have managed to get just over 30,000kms from my 595's and I have a pretty heavy foot
Both are very good tyres for the price.
I hope this helps with your decision.