Coding system of choice

Hi guys, I'm a coder myself and at the moment I personally code on a laptop. (It is bulky, can't take it every where but it gets the job done.)

Anyway, I was wondering what you guys prefer to use to do your coding?

There's a wide variety of choices starting from Netbook, Notebook, Ultrabook, good old Desktop and some people even code on an Ipad!

Anyway, please state what you use to do your coding, why do you prefer to do it and how your experience is different or more efficient compared to coding on other systems already mentioned above?

Thanks.