I have both but my laptop is an Old Bag Of Bones!! LOL So I'd like to get a new one. I use one at work but since I have a docking station with keyboard, mouse and monitor hooked up, it's like having the PC right there anyway and I let that set up.
I am definitely more of a Laptop person than a desktop individual. A Laptop is more portable, and I can take it to work, use it in the library, on the move, commuting, and much more! Both have their advantages and disadvantages, though.