The xps is probably a better machine, but for what you get its more expensive. The xps case is pretty big so im sure its more modable than the average dell. Just because Alienware has cool looking cases doesnt matter because Falcon NW will always make the best high end machines. The Falcon NW Mach V will put the alienware to shame, if you have some money to spend. So its really no competition, but if I had to choose I would probably go with the Dell.