1440p is fantastic IMO. It's a huge upgrade from 1080p while 4k is just too much for desktop use. But it will prolly depend on what games you play. MMO's are great as there is more room for UI elements and UI elements. Adventure style games have greater detail but that detail can be lost in faster moving fps games.
For competitive games, many opt for a 1080p 144hz monitor over 1440p 60hz monitor.