Always flew Delta whenever we flew from Ph to US (via Narita), but tried JAL because they had a direct Narita-San Diego flight instead of Narita-LA-San Diego. Seating space was slightly more comfortable. Food was a little more palatable than what I'm used to, and they offered more choices on the tray. There were less English movie choices but it was interesting to watch the Japanes movies.
Overall, its the little things that made this flight more comfortable than my usual flights. I liked the array of pockets in front where I can store water, gadgets and magazines separately. Service was lovely. Flight attendants were always nice and respectful despite the long flight. Best of all, bathrooms were remained pristine even at the tail end of the flight, with toothbrushes and ammenities laid out of you inside. Will definitely book JAL next time I fly west coast