For me in actually processing photos the only time I notice a difference between desktop and notebook is when I don't have a real mouse and don't have a 2nd monitor.
Yeah, I know I can run dual monitor on a desktop, but I have a PC setup in our living room and two monitors is a bit too much to put away when we have guests. I guess that is another reason for a laptop for me.
Ultimately it comes down to portability. If you want to travel with it you need a notebook. Even if a netbook is up to the job the screen is too small for anything other that minor edits.
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