For me, it completely depends upon the plane. T&B in Zekes when flying early Japanese, but I switch to BnZ when I fly American or late war Japanese (Franks, Georges, etc.)
If my opponent starts to T&B in a BnZ plane, though, I will go T&B. I was flying Zeke's the other night with the guys, but the map was unbalanced, so I went Red. La-7's, P-63's, Yak 9U's.