The most versatile form of computer
Although I have a smart phone, tablet and modern laptop, my computer of choice is still my desktop with a full size keyboard, mouse and flat screen monitor.
As I touch-type (ex navy telecommunications) I can communicate so much faster and easier with a full size keyboard. In addition a desktop PC allows me to easily upgrade components if necessary and I have substantially more power than any other smaller device when considering cost versus performance.
I read my emails when away from the home or office on my Galaxy smart phone or tablet like everyone else but if I need to send a message then if it can wait, then I would prefer to use my desktop and proper keyboard.
What's wrong with a laptop you might ask, well you do not have much control over what keyboard you get with a laptop. Laptop keyboards are generally fine for the hunt and peck typist but they lack the feel of a high quality keyboard.
No real typist would choose one of the new "Chiclet" flat keys popular with most modern keyboards either. There is no way to identify if you are hitting the center of the key or the edge when touch typing on one of those. You need indented key tops for that with the two raised feeler bars on the f and j keys to find your home finger positions.
And there is not much motivation to dragging a full size keyboard around with your laptop although some people do take an external mouse with them to use with their laptop rather than the membrane mouse system popular on laptops.
Nope, when I have the choice, I prefer to work on a desktop machine.