Historically speaking, between average Android device and average Chromebook, latter is far easier to get mainline kernel + "normal" Linux distro running, e.g: 8 Chromebooks vs. only 1 Android device (and even that is a dev. board) in official Arch supported hardware list:
https://archlinuxarm.org/platforms
Alas, new Chromebooks are no more. "Successor" Googlebooks are all Android.