I've tried a few distros in the past and have now settled (on NixOS for servers and tinkering, and Fedora for just-working). But I've never tried a BSD and would also be curious how using one would turn out.
Maybe getting into FreeBSD for a bit would be a fun little project.
FreeBSD is infinitely better than any flavour of Linux if you can do what you need to on it. Great performance, superb documentation, the software just works for the most part (an update in the libc isn't going to break any of the base packages, for example). It takes a while to get it set up, and it can be picky about hardware, but I totally recommend
No, because Docker is a tool for running Linux containers.
You can use the Linuxulator to run Linux binaries on FreeBSD, including entire distro userlands in Jails. You can use Podman to build and manage OCI containers with Docker-compatible commands.
In other words: you as making the classic XY mistake.
Maybe getting into FreeBSD for a bit would be a fun little project.