On Star Alliance there’s Turkish and the regular business class seats are hard to beat when it comes to being beds. Lie flat, open ottoman.

The window pairs for two people travelling together are near to being ideal, but there is a strong caveat and that’s getting out from the window if the spouse on the aisle side is sleeping.

With Oneworld, this is one of JAL’s B777-300ERs Apex seats Unimatrix One mentioned. It’s a window seat which is private but has its own access issues as you need to fit through a narrow passage to get in and out. The photo is of me and the narrowness wasn’t a concern.