Which one is better video card: 512MB ati radeon HD 4570 vs 128MB geforce 8500M GS for running games, movie?

also what is benefit of customising with window XP when buying laptop?|||ofc man 4570 its better than this GS card.GS cards sux.if u want geforce u got GT or GTX.but between those 2 ofc HD 4570. gd luck