Much of a muchness really. I always take 161 and 138. The differences in the seat are so small. I feel a bit better in the cavernous 777 compared to the 330 but the timing is the thing for me. 138 works so well, full day at the office then straight to the airport to my all time favorite lounge, the Qantas first lounge, then on board with a full stomach and straight to sleep. For some reason I'm very alert when we land and straight to the arrivals lounge as it opens and churn through the stack of emails that have piled up during the trip before back home to wake up the wife and kids.