I agree with all. F ex Japan is a better experience with a better lounge. It's also nice to look forward to and a great little perk right at the end of your vacation.
Overall not a HUGE difference but that's what I would do.
Incidentally, if you have time, OP, please come back and tell us how you feel about the difference between business and first on ANA. Frankly, recently I am sticking with business. I've decided that upgrading with miles simply isn't worth it anymore. Upgrading with points however, I still do occasionally, since they expire and I usually by J tickets.