Graphics Cards

[Mercedes1787]

I was looking at the Rockstargames newswire when I noticed a prize for a social club tv contest and it was an nvidia gtx 470 and then I remebered my graphics card thread on this forum.

I couldn't find it so I went on google and searched "ati radeon vs nvidia" most of it was from the early noughties (2000 & x's) so it wasn't helping, one site was a little helpful ( it said the the PS3 uses nvidia and 360 uses ATI )

I also found something saying that ATI was better at Direct3d and Nvidia was better at OpenGL. last time I asked about graphics cards someone told me that ATI's have bugs on large displays. and something about one having better bandwidth.

My questions are:

Which card is better for what (apart from direct3d and opengl)
And does GTA IV use direct3d or opengl?
And which card performs better for high end gaming in general?

[Mercedes1787]

*bump*