This is certainly one of those "Well, it depends...." sort of things, but...
Hypothetically, if one were to consider *BSD for hosting a bunch of static web sites, but using Caddy, would one prefer FreeBSD or OpenBSD?
Idea is simple, stable, secure, without too much fuss. I've tried OpenBSD with httpd and relayd but didn't love httpd. Prefer Caddy if possible.