I don't really want to get too deep into it because this same discussion comes up every time there's an article about FreeBSD :)

But my personal reasons are:

- Less commercial influence on the OS and "distro" development process (think of things like Canonical pushing snap and other not-invented-here behaviour)

- A stable (release-based) base OS with rolling packages. The perfect combination which for some reason is not as common in the Linux world. There it's usually all-rolling or all-release.

- The ports collection - Recompile any repository package with any parameters you like

- Excellent documentation because the world is not as fragmented as on GNU/Linux

- Not as much drive to constantly change things as on GNU/Linux (which is partly driven by point #1 of course)

- ZFS on root <3 And jails and bhyve

I did exactly the same and my reason is : Linux is chaos, FreeBSD is order. FreeBSD is so very well engineered, everything feels just right and logical. It's not the case with the fragmented world of Linux distributions. Unfortunately FreeBSD doesn't have the laptop driver coverage Linux has so I'm using Void Linux on my laptops because it is the most BSDish Linux.