I have a desktop.. But I am getting a laptop soon.
There are some disadvantages of using a laptop, the main one being you can't upgrade it as freely as a desktop.
But the mobility is just great.. You can take your computer with you anywhere and use it.
I am wondering why I got a desktop computer in the first place, as I need to travel and work in other places with my computer.
And if you can afford it, you can even get reasonably good gaming laptops.
Trust me, if you are not that concerned about money and you think that you might need to move around in the future, get a Laptop!