I have no idea what kind of games Alienware has or how much it costs. Other than their ability to talk smack about the Switch, why would a get this Alienware thing?
It runs windows, so it has access to any game available on windows/steam, etc. So long as the specs are met. So... you'll probably be able to play lots of PS360 era games, and indy stuff. Modern AAA games will be a stretch.