Can't help ticketing BR.

Anyhow, in respect of the initial question, one factor is indeed 2x2x2 vs. 2x3x2, which speaks for the 333. However, although the J seats look the same, the ones on the 77W are slightly wider (22in vs. 21in on the 333) and also the bed in full flat position is significantly longer (78in vs 61in). As I'm quite tall, I find the 77W much more comfortable, but some of my shorter colleagues barely notice any difference ... So I go for the 77W, whenever I have the choice, despite the 2x3x2 layout