If you need the ability to run 32-bit binaries on an amd64 install or have Linux binary compatibility, FreeBSD has options to provide these while OpenBSD does n

If you need the ability to run 32-bit binaries on an amd64 install or have Linux binary compatibility, FreeBSD has options to provide these while OpenBSD does not. I run OpenBSD on one of my laptops, but if performance or compatibility are important factors, you might look at other tools for the job -- the different BSDs have different strengths.