I have had both, I currently have the Nitto X-Terrain as you saw Pete
The BFG all-terrains are definatley louder, and they will cup like hell with the IFS, and will come apart when you ignore that cupping and then wobling
So I say Nitto, and yeah they may be a softer tire, and they may wear out sooner than later, but I am happy with them so far.. I went 15,000 without a rotation and just barely saw the feathering and cupping.
If I get at least 35,000 which I think I will, I'd be happy