Depends on what type of games your planning on playing. i3 is the entry level CPU so If you're planning on doing ANY gaming I would recommend the i5. Other than the CPU the systems are identical except for the build design and some onboard peripherals (see the specs page on the Dell website for each product). The 5470 video card is also entry level but if your playing older games it should run fine in medium to high detail at 720p resolution (Halo, Half-Life 2, Counterstrike, Blizzard games, Unreal Tournament III, Call of Duty 4). The HD4670 in the Studio XPS would be the better choice if your trying to build a decent gaming laptop without spending too much.