Laptops are purely meant for tables/desks.
I want you to read that sentence a few more times.
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With the iPad Air or Mini you can fully lay down in a more relaxed way with the Pad resting vertically on your chest. And you can navigate the Web effortlessly and elegantly via hand gestures alone. With a laptop I would think it would be awkward trying to use the track pad while laying down.
Depends. Also there's no way to easily "rest" and type on a tablet while lying down. I put my laptop down on my legs, knees up a little, and there's no need for me to "hold" it. It just sits there.
I think it boils down to this: whichever you use, you'll adapt. But IMO there's no way to easily TYPE while lying down with a tablet. When I don't anticipate needing to do a lot of typing, the laptop sits off to the side. When I think I'll be doing a lot of chatting, the laptop comes out.