Which laptop is better: The Dell XPS 15z ($999.99 model) or the Alienware m14x ($1099 model)?

Im willing to pay at most $1100 for a laptop and not much more. I need a laptop thats reliable, that wont brake easily and has a lot of memory. While i would love a laptop that can play almost every game at 100%, gaming is not my main priority. It would just need to run tf2, hl2, Garys Mod, Fallout 3 and minecraft (maybe more in the future) . So, which one should i get?