3DS has the successflu dual screen type of the DS and the advantage of Nintendo titles which Vita can no way match....
dual screen is a gameplay advantage of the 3DS but this time it will also have advantage on the visual thing because of the 3D which is more exclusive to 3DS than Ps3/Xbox 360 graphics are on the PSV
don't mind my username, that was more than 10 years ago, I'm a different person now, amazing how people change ^_^