I've got both.
I had a really old desktop when I lived with my mother, so I used the money from my saving account to buy myself a laptop, hoping I'd be able to have wireless internet so I could take it to my room.. but we could never get wireless to work =/
Well now I've moved in with my father and I use his desktop, cause there's no wireless here either, but as I'm on here a lot and the four of us living here want to use it very often I'm trying to persuade my step-mother to change the internet provider to AOL so we can get a free router. That way I can go up to my room with my laptop, my father can use his laptop wherever and my brother and step-mother can use the desktop. (this is my mission tonight as our contract runs out like next week with the current internet provider, and my step-mother knows nothing about computers and my fathers away, so she's only got my word =] )
And when I go to NY next year my mothers buying me a macbook from there as an 18th b-day present and so that I can use it for when I go to University next September.
Oh and for games I use my fathers desktop =]