The Z12 have better vocals, but has a spicie treble. for technical performance, they are up to par, but for it's price the ie200 is better than the ie300. the ie200 and the z12 is really competing with each other. i really can't choose between the two, but for your money's worth, the z12 gives you much more. better cables and stock tips, the ie200 is very very lightweight and comfortable tho.