Andrew knows - stay away from laptops unless you absolutely must have one for the portability and beware, they also have a lot more problems - are much more prone to being damaged, dropped, etc...
it all depends. most of the time desktops outperform laptops. Desktops have much more cooling space than a laptop. if you want to game get a desktop with at least a dual core processor and 2gb of RAM. Also it is much cheaper to buy a gaming dedktop than a laptop that can handle some games. like a $400 difference.
depends on how much free R.A.M. you have as well as booting settings,how many programs loading with windows at boot time,ect.
no one thing to consider
either laptop OR desktop