Ubuntu, it’s very predictable. I previously would always go for Debian but recently switched over for the LTS releases.

I used CoreOS professionally. In some ways it was great, but if you needed to change things it quickly turned into an undocumented headache, and then they deprecated it without a replacement. Thanks Red Hat.

I use Alpine or scratch for container images.

I’m using Alpine/Docker

Kind of, but they deprecated CoreOS and stopped releasing security updates long before Fedora core was released, and even then it wasn’t a drop in replacement so a lot of rework was required. It caused me to lose a lot of trust in Red Hat.