N-Trig on upcoming Sony devices vs Wacom

I have heard various reviews of Wacom and n-trig.

I just want to know which is better.

The devices I am mainly looking at are coming out soon.

These are the two I am looking at

The sony vaio tap 11 has ntrig

the surface pro 2 has Wacom (unannounced but the surface pro has Wacom so it is inevitable)

which one is better?