For me that's the biggest disadvantage - it tempts one to tinker, then you spend lots of time & money pimping your PC, which eventually causes it to die a horrible death.
After my last disaster I bought a desktop replacement laptop and have enjoyed 12 months of stable computing without any temptation to add new bits.
I bought a desktop replacement because I have no intention of using it in the move, and it's got a nice big 17" screen and an almost full size keyboard.
The only time it leaves my desk is when I use it downstairs for cataloging my CD collection and the long slow process of ripping my thousands of singles and albums.
As for the poll - I ticked lower price, because that's the only real advantage of a PC as far as I'm concerned, laptops now are as powerful as all but the most screaming games PCs and scientific workstations, and most laptops are better designed than all but Apple desktops
I'm with Laurie53 here. Not just that, bigger screen, full size keyboard with propper keys, more sockets to plug things into. also much easier to fix when a component fails, like my graphics card did two months ago.
I must admit if that was one of the options "it can be upgraded" that is. That would have been my choice as well. With a laptop you are pretty much stuck with what you get, with a desktop you can upgrade.