For starters, the Boerbel doesn't have
ojeriza
The ones I have met (these were well bred dogs) tended to be a little shorter and stockier. They aren't as quick or agile, being built more on a square.
Boerbels are excellent guardians, good family dogs but need a responsible, confident, strong willed and intelligent owner -- much like a Fila. They are more straight-forward in character, share a high intelligence, but without the cunning (or as some would say, devious) streak, a little less self-determined and independent minded, although still much more so than a Lab, Doberman, GSD, etc.
Overall, I've liked the ones I've met very much, they did, though, lack a little edge and the uber-extreme bonding that living with Filas has got me addicted to. If I hadn't ever seen a Fila, I'd probably be very happy with a Boerbel.