Basically there are 4 main branches of BSD.

- FreeBSD: The most popular, and the most optimized in terms of performance.
- NetBSD: The one that supports the most platforms
- OpenBSD: The most secure, so much so that it is the operating system with the least vulnerabilities in the world.
- DragonFlyBSD: The most innovative, it has a file system called hammer, virtualized kernels...

For a normal user I recommend FreeBSD.