one and only international configure 777W (777-300ER).
for what type of craft is available, why trust seat guru when the airline website is available?
business seats are all the same on either of the three...
https://www.ana.co.jp/wws/us/e/asw_c...c=b777_300er_1

for seat choices for couples, the thread above is exhaustive.
yes, the J class seats are staggered and separated from each other.
window seats are recommended even when traveling with a companion.