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FreeBSD can now boot in 25 milliseconds
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Unbreakably stable, cohesive (no need to fit and manage tens of different pieces to get a get a functionning OS), performant, bhyve, BSD licensed (can be a pro or con tho). It has quite a lot of stuff that makes it worthy of Linux or other BSDs.
EDIT: Almost forgot ZFS.
Not to mention that generations of Playstation and Nintendo consoles run on top of their work, and Apple's macOS also has deep roots into the BSD history