Apart from the form factor these are very different machines, so the choice should be easy. If you need windows apps, don't care about the extra 200$ and don't require it to be always-on, x70. OTOH if generic linux apps are good enough for you (and don't mind the occasional NIT style tinkering to get something done), and would like it to be online (im, email) all the time, and care about the 200$, touchbook (with some reservations as it's not actually shipping yet). Personally, I don't have a windows machine so I have no use-case for the viliv (the price difference makes it uninteresting to put linux on it even if possible), but I'm likely the minority in that regard.