The main advantage is that in ChromeOS, things like Netflix and Hulu work at full resolution. And everything is touch optimized. Under Crostini, Linux apps are getting very well integrated.
Note, that there are still a few things that are in the works yet. I'm on the beta channel, and just got v74, which gives audio support to Linux apps. And 3d is still being worked out. (Audio in isn't in place yet though, for security reasons).
I also have a Thinkpad X1 Yoga, which so far has been 0 trouble with Linux (suspend/hibernate work as expected). The only thing that doesn't work is the fingerprint scanner. Thinkpads in general are fairly well supported, partly because many Red Hat developers carry thinkpads from what I've heard.