Depending upon your systems, it should be fairly easy to make a bhyve install, using uefi as loader, for both. A very old article by Greg Lehey, once summed it up well. He wrote to look at their slogans. OpenBSD's slogan at the time was something like not one security hole in however many years, and FreeBSD's was The power to serve, while NetBSD's was Of course it runs NetBSD.
But, without any empirical testing, based on last running OpenBSD on a VM a year or so ago, I'd say that OpenBSD is a bit slower and has fewer programs (many of which you don't need, anyway), but may have better support on laptops. Depending upon what you're using the workstation for, FreeBSD may be a better choice for "typical", whatever that is, desktop stuff such as playing videos. As for as an office suite, reading pdfs, printing, and scanning, there's probably little difference. But as
jbo@ says, it's a pretty old thread to bump up. Virtualization has gotten better, and it's very easy to try both and see which you like. Or do a web search choosing to limit it to the past year. A cursory search like that shows me lots of places discussing it, as well as videos.
You might want to ask at daemonforums.org which, while covering all BSD's, seems to concentrate mostly on OpenBSD. This is a FreeBSD forum (duh), so the majority of people here will have some bias towards FreeBSD.
. I'll give it a try then.
