After some more research into why people prefer each card I came across this thing called physx, apparently it can make some** games look better on nvidias, but the key word there was some.
But hell, i will admit it also, I am a nvidia fan as the graphics card in my current computer ( Mobility Radeon HD 5000 series) is complete and utter trash, so i tend to prefer other makes. But I'm not going to let my bias get in the way of making a hopefully awesome computer.
Thanks to all your responses!