Literally nothing except a different form factor. FWIW, I wish there were Chrometablets too. The Pixel C is headed this way in form, but unfortunately toward Android and native apps instead of ChromeOS and the Web.
Indeed. I use Android devices and think the market is headed toward native vs. the web too, I just hope it's not zero sum. ChromeOS is arguably less functional than Android, but there are use cases for it, and its stripped-down, web-only nature, in many respects is a feature, not a bug. I also really don't like commercial app stores. Discovery is terrible and then who wants to try a couple different versions of an app, before finding the best in class, if not immediately obvious? At least with web apps discovery is easier and switching costs much lower. Native apps also feel less configurable, less extensible, silo'ed off, and don't offer the freedom software provides for on a desktop anyway. I know this all may change in the future - I'm hopeful it does!