I flew on CX's a359s multiple times since December. The first time, I flew CX198 in December on an A359 and my seat 45K supposedly had good window alignment, according to aerolopa so I was pretty happy about that... little did I know that the window alignment was actually rubbish until I boarded

On my next few flights, I chose 43A and those did have good window alignment, despite aerolopa showing kinda bad alignment. Aerolopa is usually a good source, but for CX a350s, it's not really. For Y+, it looks like for 31K you have to lean forward slightly to see out the window and it should be good, but for 32K it looks like the window is directly beside the seat with the headrest at the same depth as the back of the window. I think it's down to personal preference, but it's very easy to check by just searching for Cathay Pacific a350-900 premium economy, and you can see it in the photos of the cabin.