Tested out the X1 Carbon 6th gen Thinkpad with OpenBSD 6.3 after running FreeBSD 11.2 on it.
Here are my thoughts after comparing the two.
Just a rant.
No benchmarks or anything - just purely based off using it for a few days.
Overall, OpenBSD is way better in terms of out-of-the-box compatibility but FreeBSD performs way better on this laptop in my opinion.
UPDATE: OpenBSD now runs amazingly well on this laptop and is my daily driver.