I'm looking to use up the last of my accrued miles taking a trip to Japan next fall. I want to book before the devaluation. I'll have about 75k miles to use on the trip. This means I'll be able to fly J in only one direction. I'll be going SEA-TYO. It looks like I can easily connect through YVR (JL788), LAX (AA788), or ORD (AA788). I have three questions.

1) Who has the better J seat, AA or JL? Should I prioritize experience (i.e., service) or comfort (i.e., lie flat to sleep on the redeye)?
2) Who has the better Y seat, AA or JL? Which will offer more space (AA 9-across v JL 8-across)? I would prefer an exit row.
3) Which direction should I select for the J flights? Do I choose exTYO on a redeye and the ability to actually sleep or exNA and the opportunity to enjoy the service?