1080 is probably fine for a laptop. basically you usually want at the very least a 24' monitor for 1440p (more commonly 27'+ is recommended) because the smaller the monitor the less noticeable a higher resolution (in games/movies...). and I assume your laptop screen will be less than 24', so not that many benefits.
I guess the only counter argument would be that you sit somewhat closer to your laptop screen and in windows a higher resolution gives you more space (but also everything is smaller, so personal preference). probably not enough to make it worth though.
anyway, one of the main reason why I think people should buy 1440 in 2020 is because it will become a fairly standard resolution for gaming in the next 1-2 years. e.g. cheapest gpu for 1440 gaming is like $350 now, so $200 (or less) for a 1440 gpu isn't too far away with the next gen gpus coming out in the next 6 months. however, you probably can't upgrade your laptop's gpu anyway, so by the time 1440 becomes cheap you might as well get a new laptop, hardware for laptops is always more expensive anyway, so it will probably take 1-2 years longer than on desktop.
sorry, this is getting kind of long. but some other thoughts: 240hz isn't worth it either way on a laptop; also why don't you just buy laptop with a cheap screen but also buy a monitor and connect your laptop to it?