the i5 will be faster and you will notice a major performance increase with the ssd. ux31a will be an upgrade my question is what is the screen resolution? If you edit 1080p video then you may want to invest in a 1920x1080 screen.
Yup it has a 1920 x 1080 matte screen. Either way, whats the benefit of using a full hd screen over a 1366 x 768 to edit 1080p video? I'm unsure of this.