I haven't read any of the others in an age, but New Spring was so much better than the second half of WoT. Basically because he had to fit an entire story into one book. He's a very good writer, but since his wife become his editor he's stopped writing with an aim, he just packs in more and more pointless detail and gets nowhere
So, New Spring. But from what I can remember of the series proper, Shadow Rising was the best...