I wouldn't pick row 6 on the 788 as it doesn't work for either day or night flights. No windows in the day time an you are close to potential bassinets in Y and even people going though the curtains could get annoying after a while. The toilets flushing on both sides can't be fun.

I think for a couple the AE or FK combinations are best but these seats do point away from each other which can make conversation tricky. If I'm on my own I would always go for an A or F seat on a 788/388/359 - I think the poster that suggested this was a bad idea was thinking of the 777 seat config.