CX250 has an F cabin, which means it also has a very pleasant J mini cabin at the front (row 11 and 12 -
https://www.cathaypacific.com/cx/en_...g-777/300.html switch the dropdown to 77H or 77A). I'd definitely get CX250 if you can get a seat in there,
CX256 will be 77G or 77K - it has a smaller J cabin as well, but it's next to PE and not as quiet/pleasant in my experience.