I'd think use 1080 if your screen is 1080, because with 1440 the bigger size video feed will have to get resized to your smaller screen - so you'd lose / not gain anything.
unlike 4k which is 4 times the numbers of pixels as 1080, 1440 isn't a nice and easy multiple of 1080, so more "resizing" logic would have to be done - "interpolation", and that can add artifacts + softness.