I've flown transatlantic 4 times always in row 14 and it's a great Elite benefit.

A and K are "window" seats and the door mechanism intrudes in to your legroom. It looks awfully tempting to rest your legs on it but there is a big sign saying not to do so.

The toilet in front is for business class. I've never heard it and never been bothered by smell or anything else so I would suggest 14 is the way to go.

One of the disadvantages though is that the centre seats is a bassinet row and each time there's been young children in this area and if you get a noisy one this can detract from the experience.

I prefer the HK side to the AC side only because at boarding the entire plane load of passengers walks past 14A and C.