T6400 Vs SU9400

Better CPU in what regards?

The SU9400 is a low clocked, low voltage CPU. So in terms of computing power it won't be so good. However, it will completely rock in terms of battery life.

The T6400 is a full blown CPU. It will give better performance, but won't be as good for battery life. It'll still be decent but not like the SU9400.