the fps you get will depend on the resolution; if you get 150fps from a 1440p monitor, you will not get the same from a 4k monitor.
but the question is .. which one do YOU want more.
4k is more relevant for the detail. on the other hand, a faster refres will make *moving* images clearer.
if you play normal games, such as call of duty, witcher .. idk any more, i dont play those game. anyway, if you play THOSE games, then a 4k is preferable.
(although you do have to understand that some titles, like witcher 3, will have a much slower framerate in 4k due to the detail and various effects, such as HairWorks)
if you play FAST games, say, a scifi racer game, or maybe even Overwatch, then the 144hz monitor is what you want.
One is for show, the other is for hardcore users.