I have a question to CGMiner

Here the picture to my question

http://gyazo.com/1f8fd01ca6884df17db31b4bbb73f1d4

CGMiner shows for

GPU 0 746 Khas and WU: 668/m

and

GPU 1 706 Khas and WU: 673/m

Now my question. What is the more important value? The Khas or the WU.
Is it better to have a higer WU value and lower Khas or is it the other way around better?