I have an Asus C202 flashed with MrChromebox's coreboot (seabios payload). I run Arch (Mate Desktop) from the SD Card, and I couldn't be happier with it. I'm lucky that all my peripherals basically just worked. I think other model chromebooks would likely have been trickier.
Initially, I wasted 6 months running Ubuntu in Crouton, but it never really worked the way I wanted it to. I also used NayuOS (partially degoogled chromiumOS build)… more privacy, less security, a little glitchy… meh.
My advice is get away from ChromeOS/ChromiumOS. Run a real OS (whatever that means to you) directly, no chroot.