Think a tablet or netbook would benefit more than a desktop or laptop.
Should I decide to get a tablet, we'll see how it goes for Windows 8. Otherwise, Android it is lol.
Win 8 tablets will replace laptops for many people. Theres going to be many W8 tablets with keyboard docks, so they basically transform in to a full laptop. I see no reason at all to get Android or iOS when you can have a all-in-one tablet/laptop with a full blown OS that works with the millions of peripherals that Windows does.
Most people have a tablet and a laptop because the tablet is very limited, but this will end with Win 8, it can function as both devices extremely well. Technically a W8 tablet could also replace a desktop PC if the user does not need something massively powerful, because you'll be able to connect W8 tablets to monitors, keyboards and mice.
Then theres new Win 8 laptop devices like the Lenovo Yoga where the screen flips 180 degress so you can use it like a tablet (the keys also get disabled when you flip so you cant press any by accident)...