Choosing a host os for linux containers and kubernetes

Has anyone tried CoreOS Container Linux or RancherOS?

What do you usually use as a host OS for Linux containers / kubernetes?

I’m primarily interested in this because of kubernetes.

Previously I’ve always used FreeBSD and tried to avoid Docker, but with kubernetes I want to give Linux and containers a try.

It seems like some of freebsd people are interested in supporting kubernetes on freebsd …