Topic Enhancement Imbues
Depends on playstyle etc.
I always use WF/FT for pvp too and swap to FB when I need to peel badly or when trying to kill resto druids.
WF/FT provides more healing options and insane dmg to clothies. FB is somewhat better on plate if you're with a healer. I suggest you try both and see what you like, but for this exp pack WF is probabaly the best overall choice. Might change in MoP with Unleashed Fury.