Also. Unless you spend $800 for the Asus Swift, and $1200 for the graphics solution to run it, you can't get 1440p with a high resolution natively.
I have flagship monitors from the best brands in both 1080p, 120Hz, and 1440p, 60Hz IPS. For gaming, I pick the 120Hz monitor nine times out of ten; the higher pixel density doesn't matter when compared to the smoothness of the faster monitor.
Also, a lot of content is far worse at 1440p. There's a lot of stuff out there not designed for it, that either breaks or just doesn't go to a high enough resolution and so looks awful.