Having flown on both LY's 747-400 and 777. The 777 is nicer (to me) and a lot more quieter. The 777 seemed a lot cleaner too. My only gripe is being seated in an exit row and have been awakend by inconsiderate **** who think their right to pray (practically standing on top of me) is more important then that of those whose sleep is interrupted by physical contact and audible contact. I do fly LY because of the security though.