Laptops where you want to use standby/suspend/sleep, as it's very hit-and-miss on whether or not this will work with any laptop + FreeBSD version combination.
Servers where you want to use Xen, KVM, VMWare as there is no host support for these in FreeBSD. FreeBSD works fine running in a VM as a guest, though.
Desktops where you need fast 3D graphics for playing games.
Desktops where you want to run pure 64-bit, as there are no 64-bit versions of Flash, binary 3D drivers, binary sound drivers, a handful of apps, etc. This is also a problem with 64-bit Linux and 64-bit *BSD, though.
Beyond that, it's pretty much "which OS are you most comfortable in", and "which OS can you be most productive in" for deciding which OS to put on which system.
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