A laptop is most definitely my "weapon of choice", although I use it like a desktop as mine has a 17" screen so it's not particularly portable. It's just the most comfortable for me to use for longer stints.
I sometimes use my phone, but only for light browsing really. I find it's a bit cumbersome to use it for much else, and that's primarily the reason for me not owning a tablet. For what they cost, I don't think I'd particularly get the use out of it.
laptop vs. Mobile phone and iPods then I would rather go for a laptop because of the portability and more so it has a backup battery power that I can use at any intervals. A and a laptop has more functionality and can function with high range of software that can fetch me more money.