I find, on flights where you have to pay for snacks and drinks, it's easier for me to sit next to SO as he keeps his wallet in easier reach so I don't have to go rooting in my bag, disrupting everyone and it saves making an order and asking "him 2 rows back 1 aisle over" to pay for it LOL

If it's full service that's not an issue.

Short haul flights, i'm not so fussed about.. in fact if we can't get the 2 seats near the exit then we will purposefully pick 2 aisle seats. Close enough to chat quietly but far enough away for some 'space' but long haul, I'd like to spend the flight with SO but that's just so, like mentioned, we can share the same movies on ipad, we switch plane food round a lot between us and we use each other as a pillow prop.