Both are pleasant on JJ, but the A330 is the one I prefer. The A330 seating is more comfortable for most people. The 767 is OK and they are not old ones, but the A330 is quieter and smoother IMO.
I frequently take the US flight to CLT because it is usually cheaper, but I prefer TAM. The TAM GIG lounge is pleasant but fairly small. It is normally not too crowded because all the other *A into GIG use the GOL lounge, a legacy from varig membership in *A.